What can help you make a fortune in the future? Graduating from a top university might not be enough. A new study from the University of Essex in Britain has shown that the more friends you have in school, the more money you'll earn later.
The idea that popularity could have a serious effect on one's earning potentia（潜在性） shouldn't come as too much of a surprise. The researchers found that if you want to get ahead in life, social skills and networking are easily as powerful as talent and hard work..
“If a person has lots of friends, it means that he or she has the ability to get along with others in all kinds of different situations," said Xu Yanchun, 17, from Nantou High School in Shenzhen, who totally agreed with the recent finding. "Also, friends always help each other. They not only create wider social circles for you but lift your mood when you feel bad," said Xu. She believed that all this helps you "earn a higher salary”.
Maybe that's why some people think the younger generations are in the age of Friendalholism (交友狂症). A woman even complained that the networking website Facebook's 5,000-friend limit was too low for her large number of social contacts.
But what does a friend mean? Should friends be regarded as a form of currency（货币）?
“Call me uncoil, but I think of a friend as an actual person with whom I have an actual history and whom I enjoy actually seeing. It seems, however, that this is no longer the definition (定义) of ‘friend',” said Meghan Daum, who works with The Los Angeles Times in the US.
Daum dislikes the idea that quantity trumps quality in the age of friendaholism. She thought the idea of friendship, at least among the growing population of Internet social networkers, was to get as many of not-really-friends as possible. For example, a friend might be someone you might know personally but who could just as easily be the friend of a friend of some other Facebook friend you don't actually know. Although she agreed that social ties grease (润滑) the wheels of life, she also wamed, "Too bad one thing money can't buy is a real friend."
1.What will be needed if you are to achieve success according to the researchers?
A.Social skills, friends, good mood and fortune.
B.Social skills, talent, hard work and facebook.
C.Social skills, networking, potential and fortune.
D.Social skills, networking, talent and hard work.
2.What can friends do in the eyes of Xu Yanchun?
A.They can help you with your schoolwork.
B.They teach you how to make more money.
C.They introduce their friends to you.
D.They help you to get rid of sadness and cheer up.
3.We learn that Meghan Daum's attitude towards friends is somewhat _____.
A.up-to-date B.traditional
C.confused D.optimistic
4.What does the word "trumps" in the last paragraph mean?
A.is worse than B.is equal to
C.is better than D.is similar to
高一英语阅读理解中等难度题
What can help you make a fortune in the future? Graduating from a top university might not be enough. A new study from the University of Essex in Britain has shown that the more friends you have in school, the more money you'll earn later.
The idea that popularity could have a serious effect on one's earning potentia（潜在性） shouldn't come as too much of a surprise. The researchers found that if you want to get ahead in life, social skills and networking are easily as powerful as talent and hard work..
“If a person has lots of friends, it means that he or she has the ability to get along with others in all kinds of different situations," said Xu Yanchun, 17, from Nantou High School in Shenzhen, who totally agreed with the recent finding. "Also, friends always help each other. They not only create wider social circles for you but lift your mood when you feel bad," said Xu. She believed that all this helps you "earn a higher salary”.
Maybe that's why some people think the younger generations are in the age of Friendalholism (交友狂症). A woman even complained that the networking website Facebook's 5,000-friend limit was too low for her large number of social contacts.
But what does a friend mean? Should friends be regarded as a form of currency（货币）?
“Call me uncoil, but I think of a friend as an actual person with whom I have an actual history and whom I enjoy actually seeing. It seems, however, that this is no longer the definition (定义) of ‘friend',” said Meghan Daum, who works with The Los Angeles Times in the US.
Daum dislikes the idea that quantity trumps quality in the age of friendaholism. She thought the idea of friendship, at least among the growing population of Internet social networkers, was to get as many of not-really-friends as possible. For example, a friend might be someone you might know personally but who could just as easily be the friend of a friend of some other Facebook friend you don't actually know. Although she agreed that social ties grease (润滑) the wheels of life, she also wamed, "Too bad one thing money can't buy is a real friend."
1.What will be needed if you are to achieve success according to the researchers?
A. Social skills, friends, good mood and fortune.
B. Social skills, talent, hard work and facebook.
C. Social skills, networking, potential and fortune.
D. Social skills, networking, talent and hard work.
2.What can friends do in the eyes of Xu Yanchun?
A. They can help you with your schoolwork.
B. They teach you how to make more money.
C. They introduce their friends to you.
D. They help you to get rid of sadness and cheer up.
3.We learn that Meghan Daum's attitude towards friends is somewhat _____.
A. up-to-date B. traditional
C. confused D. optimistic
4.What does the word "trumps" in the last paragraph mean?
A. is worse than B. is equal to
C. is better than D. is similar to
高一英语阅读理解中等难度题查看答案及解析
What can help you make a fortune in the future? Graduating from a top university might not be enough. A new study from the University of Essex in Britain has shown that the more friends you have in school, the more money you'll earn later.
The idea that popularity could have a serious effect on one's earning potentia（潜在性） shouldn't come as too much of a surprise. The researchers found that if you want to get ahead in life, social skills and networking are easily as powerful as talent and hard work..
“If a person has lots of friends, it means that he or she has the ability to get along with others in all kinds of different situations," said Xu Yanchun, 17, from Nantou High School in Shenzhen, who totally agreed with the recent finding. "Also, friends always help each other. They not only create wider social circles for you but lift your mood when you feel bad," said Xu. She believed that all this helps you "earn a higher salary”.
Maybe that's why some people think the younger generations are in the age of Friendalholism (交友狂症). A woman even complained that the networking website Facebook's 5,000-friend limit was too low for her large number of social contacts.
But what does a friend mean? Should friends be regarded as a form of currency（货币）?
“Call me uncoil, but I think of a friend as an actual person with whom I have an actual history and whom I enjoy actually seeing. It seems, however, that this is no longer the definition (定义) of ‘friend',” said Meghan Daum, who works with The Los Angeles Times in the US.
Daum dislikes the idea that quantity trumps quality in the age of friendaholism. She thought the idea of friendship, at least among the growing population of Internet social networkers, was to get as many of not-really-friends as possible. For example, a friend might be someone you might know personally but who could just as easily be the friend of a friend of some other Facebook friend you don't actually know. Although she agreed that social ties grease (润滑) the wheels of life, she also wamed, "Too bad one thing money can't buy is a real friend."
1.What will be needed if you are to achieve success according to the researchers?
A.Social skills, friends, good mood and fortune.
B.Social skills, talent, hard work and facebook.
C.Social skills, networking, potential and fortune.
D.Social skills, networking, talent and hard work.
2.What can friends do in the eyes of Xu Yanchun?
A.They can help you with your schoolwork.
B.They teach you how to make more money.
C.They introduce their friends to you.
D.They help you to get rid of sadness and cheer up.
3.We learn that Meghan Daum's attitude towards friends is somewhat _____.
A.up-to-date B.traditional
C.confused D.optimistic
4.What does the word "trumps" in the last paragraph mean?
A.is worse than B.is equal to
C.is better than D.is similar to
高一英语阅读理解中等难度题查看答案及解析
WHAT can help you make a fortune in the future? Graduating from a top university might not be enough. A new study from the University of Essex in Britain has shown that the more friends you have in school, the more money you’ll earn later.
The idea that popularity could have a serious influence on one’s earning potential shouldn’t come as too much of a surprise. The researchers noted that if you want to get ahead in life, social skills and networking are easily as powerful as talent and hard work.
“If a person has lots of friends, it means that he or she has the ability to get along with others in all kinds of different situations,” said Xu Yanchun, 17, from Nantou High School in Shenzhen, who totally agreed with the recent finding. “Also, friends always help each other. They not only create wider social circles for you but lift your mood when you are occasionally in low spirits,” said Xu. She believed that all this helps you “earn a higher salary.”
Maybe that’s why some people think the younger generations are in the age of Friendalholism (交友狂症). A woman even complained that the networking website Facebook’s 5,000-friend limit was too low for her large reserve of social contacts.
But what does a friend mean? Should friends be regarded as a form of currency?
“Call me uncool, but I think of a friend as an actual person with whom I have an actual history and whom I enjoy actually seeing. It seems, however, that this is no longer the definition of friend”, said Meghan Daum, who works with The Los Angeles Times in the US.
Daum dislikes the idea that quantity trumps quality in the age of Friendaholism. She thought the idea of friendship, at least among the growing population of Internet social networkers, was to get as many of not-really-friends as possible. For example, a friend might be someone you might know personally but who could just as easily be the friend of a friend of some other Facebook friend you don’t actually know. Although she agreed that social ties grease (润滑) the wheels of life, she also warned. “Too bad one thing money can’t buy is a real friend.”
1.What will be needed if you are to achieve success according to the researchers?
A. Social skills, friends, good mood and fortune.
B. Social skills, networking, talent and hard work.
C. Social skills, networking, potential and fortune.
D. Social skills, talent, hard work and the facebook.
2.What can friends do in the eyes of Xu Yanchun?
A. They can help you with your schoolwork.
B. They teach you how to make more money.
C. They help you get rid of sadness and cheer up.
D. They always get on well with you.
3.We learn that Meghan Daum’s attitude towards friends is somewhat _______.
A. up-to-date B. optimistic
C. confused D. traditional
4.What does the word “trumps” in the last paragraph mean?
A. is better than B. is equal to
C. is worse than D. is similar to
高一英语阅读理解中等难度题查看答案及解析
What will man be like in the future--in 5000 or even 50,000 years from now? We can only make guesses, of course, but we can be sure that he will be different from what he is today, for man is slowly changing all the time.
Let us take an obvious example, Man, even five hundred years ago, was shorter than he is today. Now, on average, men are about three inches taller. Five hundred years is a relatively short period of time, so we may assume that man will continue to grow taller. Again, in the modern world we use our brains a great deal. Even so, we still make use of only about 20% of the brain’s capacity. As time goes on, however, we shall have to use our brains more and more, and eventually we shall need larger ones! This is likely to bring about a physical change too: the head, in particular the forehead, will grow larger.
Nowadays our eyes are in constant use. In fact, we use them so much that very often they become weaker and we have to wear glasses. But over a very long period of time it is likely that man's eyes will grow stronger.
On the other hand, we tend to make less use of our arms and legs. These, as a result, are likely to grow weaker. At the same time, however, our fingers will grow more sensitive because they are used a great deal in modern life.
But what about hair? This will probably disappear from the body altogether in course of time because it does not serve a useful purpose any longer. In the future, then, both sexes are likely to be bald (光秃的).
Perhaps all this gives the impression that future man will not be a very attractive creature to look at! This may well be true. But in spite of all these changes, future man will still have a lot in common with us. He will still be a human being, with thoughts and emotions similar to our own.
1.The passage mainly tells us that ________.
A.humans needn't wear glasses in the future.
B.man's life will be different in the future.
C.future man will look quite different from us.
D.man is growing taller and uglier as time passes.
2.It can be inferred from the passage that ________.
A.future life is always predictable (可预测的)
B.human beings will become less attractive in the future
C.less use of a bodily organ (器官) may lead to its degeneration (退化)
D.human beings hope for a change in the future life
3.Future man will be similar to us in ________.
A.Colour and height B.size and appearance
C.thought and observation D.thought and emotion
高一英语阅读理解中等难度题查看答案及解析
What will man be like in the future — in 5,000 or even 50,000 years from now? We can only make guesses, of course, but we can be sure that he will be different from what he is today, for man is slowly changing all the time.
Let us take an obvious example. Man, even five hundred years ago, was shorter than he is today. Now, on average, men are about three inches taller. Five hundred years is relatively a short period of time, so we may suppose that man will continue to grow taller. Again, in the modern world we use our brains a great deal. Even so, we still make use of only about 20% of the brain’s capacity(容量). As time goes on, however, we shall have to use our brains more and more, and finally we shall need our brains more and more, and finally we shall need larger ones! This is likely to bring a physical change too: the head, in particular the forehead, will grow larger.
Nowadays our eyes are in constant use. In fact, we use them so much that very often they become weaker and we have to wear glasses. But over long period of time it is likely that man’s eyes will grow stronger.
On the other hand, we tend to make less use of our arms and legs. These, as a result, are likely to grow weaker. At the same time, however, our fingers will grow more sensitive because they are used a great deal in modern life.
But what about hair? This will probably disappear from the body altogether in course of time because it does not serve a useful purpose any longer. In the future, then, both sexes are likely to be bald.
Perhaps all this gives the impression that future man will not be a very attractive creature to look at! This may well be true. All the same, in spite of all these changes, future man will still have a lot in common with us. He will still be a human being, with thoughts and motions similar to our own.
1.The passage mainly tells us that __________.
A．Man’s life will be different in the future
B．Future man will look quite different from us
C．Man is growing taller and uglier as time passes
D．Man’s organs’ functions will change
2.What serves as the evidence that man is changing?
A．Man has got stronger eyes now than he ever had.
B．Man’s hair is getting thinner and thinner.
C．Man’s arms and legs have become lighter and weaker.
D．Man has been growing taller over the past 500 years.
3.The change in man’s size of the forehead is probably because __________.
A．he makes use of only 20% of the brain’s capacity
B．his brain has grown larger over the past centuries
C．he will use his brain more and more as time goes on
D．the other 80% of his brain will grow in due time
4.Which of the following is TRUE about a human being in the future?
A．He is hairless because hair is no longer useful.
B．He has smaller eyes and wears better glasses.
C．His fingers grow weaker because he doesn’t have to make use of them.
D．He thinks and feels in a different way.
5.It is implied that __________.
A．human beings will become less attractive in the future
B．body organs will become poorer if they are not used often
C．human beings hope for a change in the future life
D．future life is always predictable
高一英语阅读理解中等难度题查看答案及解析
What will man be like in the future - in 5,000 or even 50,000 years from now? We can only make guesses, of course, but we can be sure that he will be different from what he is today, for man is slowly changing all the time.
Let us take an obvious example. Man, even five hundred years ago, was shorter than he is today. Now, on average, men are about three inches taller. Five hundred years is relatively a short period of time, so we may suppose that man will continue to grow taller. Again, in the modern world we use our brains a great deal. Even so, we still make use of only about 20% of the brain’s capacity(容量). As time goes on, however, we shall have to use our brains more and more, and finally we shall need our brains more and more, and finally we shall need larger ones! This is likely to bring a physical change too: the head, in particular the forehead, will grow larger.
Nowadays our eyes are in constant use. In fact, we use them so much that very often they become weaker and we have to wear glasses. But over long period of time it is likely that man’s eyes will grow stronger.
On the other hand, we tend to make less use of our arms and legs. These, as a result, are likely to grow weaker. At the same time, however, our fingers will grow more sensitive because they are used a great deal in modern life.
But what about hair? This will probably disappear from the body altogether in course of time because it does not serve a useful purpose any longer. In the future, then, both sexes are likely to be bald.
Perhaps all this gives the impression that future man will not be a very attractive creature to look at! This may well be true. All the same, in spite of all these changes, future man will still have a lot in common with us. He will still be a human being, with thoughts and motions similar to our own.
1.The passage mainly tells us that __________.
A. Man’s life will be different in the future
B. future man will look quite different from us
C. man is growing taller and uglier as time passes
D. Man’s organs' functions will change
2.What serves as the evidence that man is changing?
A. Man has got stronger eyes now than he ever had.
B. Man’s hair is getting thinner and thinner.
C. Man’s arms and legs have become lighter and weaker.
D. Man has been growing taller over the past 500 years.
3.The change in man’s size of the forehead is probably because __________.
A. he makes use of only 20% of the brain’s capacity
B. his brain has grown larger over the past centuries
C. he will use his brain more and more as time goes on
D. the other 80% of his brain will grow in due time
4.It is implied that __________.
A. human beings will become less attractive in the future
B. parts of our bodies will become poorer if they are not used often
C. human beings hope for a change in the future life
D. future life is always predictable
高一英语阅读理解中等难度题查看答案及解析
What will man be like in the future — in 5,000 or even 50,000 years from now? We can only make guesses, of course, but we can be sure that he will be different from what he is today, for man is slowly changing all the time.
Let us take an obvious example. Man, even five hundred years ago, was shorter than he is today. Now, on average, men are about three inches taller. Five hundred years is relatively a short period of time, so we may suppose that man will continue to grow taller. Again, in the modern world we use our brains a great deal. Even so, we still make use of only about 20% of the brain’s capacity(容量). As time goes on, however, we shall have to use our brains more and more, and finally we shall need our brains more and more, and finally we shall need larger ones! This is likely to bring a physical change too: the head, in particular the forehead, will grow larger.
Nowadays our eyes are in constant use. In fact, we use them so much that very often they become weaker and we have to wear glasses. But over long period of time it is likely that man’s eyes will grow stronger.
On the other hand, we tend to make less use of our arms and legs. These, as a result, are likely to grow weaker. At the same time, however, our fingers will grow more sensitive because they are used a great deal in modern life.
But what about hair? This will probably disappear from the body altogether in course of time because it does not serve a useful purpose any longer. In the future, then, both sexes are likely to be bald.
Perhaps all this gives the impression that future man will not be a very attractive creature to look at! This may well be true. All the same, in spite of all these changes, future man will still have a lot in common with us. He will still be a human being, with thoughts and emotions similar to our own.
1.The passage mainly tells us that __________.
A. Man’s life will be different in the future
B. Future man will look quite different from us
C. Man is growing taller and uglier as time passes
D. Man’s organs’ functions will change
2.What serves as the evidence（证据） that man is changing?
A. Man has got stronger eyes now than he ever had.
B. Man’s hair is getting thinner and thinner.
C. Man’s arms and legs have become lighter and weaker.
D. Man has been growing taller over the past 500 years.
3.The change in man’s size of the forehead is probably because __________.
A. he makes use of only 20% of the brain’s capacity
B. his brain has grown larger over the past centuries
C. he will use his brain more and more as time goes on
D. the other 80% of his brain will grow in due time
4.Which of the following is TRUE about a human being in the future?
A. He is hairless because hair is no longer useful.
B. He has smaller eyes and wears better glasses.
C. His fingers grow weaker because he doesn’t have to make use of them.
D. He thinks and feels in a different way.
5.It is implied that __________.
A. human beings will become less attractive in the future
B. body organs will become poorer if they are not used often
C. human beings hope for a change in the future life
D. future life is always predictable
高一英语阅读理解中等难度题查看答案及解析
What will man be like in the future — in 5,000 or even 50,000 years from now? We can only make guesses, of course, but we can be sure that he will be different from what he is today, for man is slowly changing all the time.
Let us take an obvious example. Man, even five hundred years ago, was shorter than he is today. Now, on average, men are about three inches taller. Five hundred years is relatively a short period of time, so we may suppose that man will continue to grow taller. Again, in the modern world we use our brains a great deal. Even so, we still make use of only about 20% of the brain’s capacity(容量). As time goes on, however, we shall have to use our brains more and more, and finally we shall need our brains more and more, and finally we shall need larger ones! This is likely to bring a physical change too: the head, in particular the forehead, will grow larger.
Nowadays our eyes are in constant use. In fact, we use them so much that very often they become weaker and we have to wear glasses. But over long period of time it is likely that man’s eyes will grow stronger.
On the other hand, we tend to make less use of our arms and legs. These, as a result, are likely to grow weaker. At the same time, however, our fingers will grow more sensitive because they are used a great deal in modern life.
But what about hair? This will probably disappear from the body altogether in course of time because it does not serve a useful purpose any longer. In the future, then, both sexes are likely to be bald.
Perhaps all this gives the impression that future man will not be a very attractive creature to look at! This may well be true. All the same, in spite of all these changes, future man will still have a lot in common with us. He will still be a human being, with thoughts and emotions similar to our own.
1.The passage mainly tells us that __________.
A. Man’s life will be different in the future
B. Future man will look quite different from us
C. Man is growing taller and uglier as time passes
D. Man’s organs’ functions will change
2.What serves as the evidence that man is changing?
A. Man has got stronger eyes now than he ever had.
B. Man’s hair is getting thinner and thinner.
C. Man’s arms and legs have become lighter and weaker.
D. Man has been growing taller over the past 500 years.
3.The change in man’s size of the forehead is probably because __________.
A. he makes use of only 20% of the brain’s capacity
B. his brain has grown larger over the past centuries
C. he will use his brain more and more as time goes on
D. the other 80% of his brain will grow in due time
4.Which of the following is TRUE about a human being in the future?
A. He is hairless because hair is no longer useful.
B. He has smaller eyes and wears better glasses.
C. His fingers grow weaker because he doesn’t have to make use of them.
D. He thinks and feels in a different way.
5.It is implied that __________.
A. human beings will become less attractive in the future
B. parts of our bodies will become poorer if they are not used often
C. human beings hope for a change in the future life
D. future life is always predictable（可预测的）
高一英语阅读理解中等难度题查看答案及解析
What will man be like in the future—in 5000 or even 50, 000 years from now? We can only make guesses, of course, but we can be sure that he will be different from what he is today, for man is slowly changing all the time.
Let us take an obvious example. Man, even five hundred years ago , was shorter than he is today. Now, on average, men are about three inches taller. Five hundred years is a relatively short period of time, so we may assume that man will continue to grow taller. Again, in the modem world we use our brains a great deal. Even so, we still make use of only about 20% of the brain’ s capacity(容量). As time goes on , however , we shall have to use our brains more and more, and eventually we shall need larger ones! This is likely to bring about a physical change too: the head, in particular the forehead, will grow larger. Nowadays our eyes are in constant use. In fact , we use them so much that very often they become weaker and we have to wear glasses. But over a very long period of time it is likely that man’ s eyes will grow stronger.
On the other hand, we tend to make less use of our arms and legs. These, as a result, are likely to grow weaker. At the same time, however , our fingers will grow more sensitive（敏感的） because they are used a great deal in modern life.
But what about hair? This will probably disappear from the body altogether in course of time because it does not serve a useful purpose any longer. In the future, then, both sexes are likely to be bald.
Perhaps all this gives the impression that future man will not be a very attractive creature to look at! This may well be true. All the same, in spite of all these changes, future man will still have a lot in common with us. He will still be a human being, with thoughts and emotions similar to our own. …
1.The passage mainly tells us that _______.
A．man’s life will be different in the future.
B．future man will look quite different from us.
C．man is growing taller and uglier as time passes.
D．human’s organs’ functions will become weak “
2.The change in man’s size of forehead will probably be because ___________.
A．he makes use onIy20% of the brain’s capacity.
B．his brain has grown larger over the past centuries.
C．the other 80% of his brain will grow in due time
D．he will use his brain more and more as time goes on :
3.What will be true about a human being in the future?
A．He will be hairless because hair is no longer useful.
B．He will have smaller eyes and will wear better glasses.
C．His fingers will grow weaker because he won’t have to make use of them.
D．He will think and feel in a different way.
4.It is implied that ________.
A．human beings will become less attractive in the future
B．less use of a bodily organ may lead to its degeneration(退化,)
C．human beings hope for a change in the future life
D．future life is always predictable
高一英语阅读理解中等难度题查看答案及解析
What will man be like in the future—in 5000 or even 50, 000 years from now? We can only make guesses, of course, but we can be sure that he will be different from what he is today, for man is slowly changing all the time.
Let us take an obvious example. Man, even five hundred years ago, was shorter than he is today. Now, on average, men are about three inches taller. Five hundred years is a relatively short period of time, so we may assume that man will continue to grow taller. Again, in the modern world we use our brains a great deal. Even so, we still make use of only about 20% of the brain’ s capacity. As time goes on , however , we shall have to use our brains more and more, and eventually we shall need larger ones! This is likely to bring about a physical change too: the head, in particular the forehead, will grow larger. Nowadays our eyes are in constant use. In fact, we use them so much that very often they become weaker and we have to wear glasses. But over a very long period of time it is likely that man’ s eyes will grow stronger. On the other hand, we tend to make less use of our arms and legs. These, as a result, are likely to grow weaker. At the same time, however, our fingers will grow more sensitive because they are used a great deal in modern life.
But what about hair? This will probably disappear from the body altogether in course of time because it does not serve a useful purpose any longer. In the future, then, both sexes are likely to be bald.
Perhaps all this gives the impression that future man will not be a very attractive creature to look at! This may well be true. All the same, in spite of all these changes, future man will still have a lot in common with us. He will still be a human being, with thoughts and emotions similar to our own.
1.The passage mainly tells us that _______.
A. man’s life will be different in the future.
B. future man will look quite different from us.
C. man is growing taller and uglier as time passes.
D. human’s organs’ functions will become weak
2.What will be true about a human being in the future?
A. He will be hairless because hair is no longer useful.
B. He will have smaller eyes and will wear better glasses.
C. His fingers will grow weaker because he won’t have to make use of them.
D. He will think and feel in a different way.
3.It is implied that ________.
A. human beings will become more attractive in the future
B. less use of a bodily organ may lead to its degeneration (退化).
C. human beings hope for a change in the future life
D. future life is always predictable
高一英语阅读理解中等难度题查看答案及解析