What’s the first thing that you notice when you walk into your favorite restaurant? Is it the smell of fresh pizza, or the sight of your favorite desserts? Food that looks and smells good will probably taste good, but what about sound? Is that important?
Scientists now believe that the taste of food can change when your ears hear different sounds, but it has to be the right kind of sound. When you turn on a microwave with popcorn in it, it soon starts to pop. Do you think “That sounds tasty!”? Not really, you probably think it’s nearly ready. But when smell it, you go to get the salt and the butter. Hearing the popcorn make you think about it, but smelling it tells you that it tastes good. So what are the sounds to change the tastes of the things?
In an experiment in a fish restaurant, customers listened to the sound of the seaside while they were eating. Did it make a difference? Yes, it did. Listening to the seaside seemed to improve the taste of the food. It was fresher and saltier. When the restaurant tried the same experiment with the sound of the farm animals, there was no difference in taste. The results are going to be useful for restaurants. Perhaps they will try to use fewer unhealthy things, like salt and sugar in food. With the right music or sounds, perhaps we won’t taste the difference.
Restaurants are also setting a connection between food and the sound that the packet(包装袋) makes. Pick up a packet of your favorite potato chips, what does it sound like? One restaurant recently changed the material that they used to make their potato chip packets because experiments show that the packet which makes a right sound will make customers think the potato chips are fresher. Another idea is that a list of music will begin to appear on food packets, so if you don’t like your green vegetables, the right music or sounds could help you learn to love them.
1.According to the passage, what makes you think the popcorn tastes delicious?
A.Turning on the microwave. B.Smelling the popcorn in the microwave.
C.Hearing the popcorn. D.Taking the popcorn out of the microwave.
2.What was the result of the experiment in the restaurant?
A.The sounds of the seaside made the food taste better. B.The customers didn’t like the food.
C.The music changed the food. D.The customers preferred the sounds of the farm animals.
3.Why is the material of the food packet important?
A.Because customers want it to sound and look right.
B.Because customers enjoy looking at the different materials.
C.Because customers think the food is good if it makes the right sound.
D.Because customers don’t like noisy packets.
4.The passage mainly tells us .
A.sounds make a difference to the taste of food
B.the smell of food makes a difference to the taste of food
C.right music could help people love green vegetable
D.there is a connection between the sight of food and the taste of food
九年级英语阅读单选中等难度题
What’s the first thing that you notice when you walk into your favorite restaurant? Is it the smell of fresh pizza, or the sight of your favorite desserts? Food that looks and smells good will probably taste good, but what about sound? Is that important?
Scientists now believe that the taste of food can change when your ears hear different sounds, but it has to be the right kind of sound. When you turn on a microwave with popcorn in it, it soon starts to pop. Do you think “That sounds tasty!”? Not really, you probably think it’s nearly ready. But when smell it, you go to get the salt and the butter. Hearing the popcorn make you think about it, but smelling it tells you that it tastes good. So what are the sounds to change the tastes of the things?
In an experiment in a fish restaurant, customers listened to the sound of the seaside while they were eating. Did it make a difference? Yes, it did. Listening to the seaside seemed to improve the taste of the food. It was fresher and saltier. When the restaurant tried the same experiment with the sound of the farm animals, there was no difference in taste. The results are going to be useful for restaurants. Perhaps they will try to use fewer unhealthy things, like salt and sugar in food. With the right music or sounds, perhaps we won’t taste the difference.
Restaurants are also setting a connection between food and the sound that the packet(包装袋) makes. Pick up a packet of your favorite potato chips, what does it sound like? One restaurant recently changed the material that they used to make their potato chip packets because experiments show that the packet which makes a right sound will make customers think the potato chips are fresher. Another idea is that a list of music will begin to appear on food packets, so if you don’t like your green vegetables, the right music or sounds could help you learn to love them.
1.According to the passage, what makes you think the popcorn tastes delicious?
A.Turning on the microwave. B.Smelling the popcorn in the microwave.
C.Hearing the popcorn. D.Taking the popcorn out of the microwave.
2.What was the result of the experiment in the restaurant?
A.The sounds of the seaside made the food taste better. B.The customers didn’t like the food.
C.The music changed the food. D.The customers preferred the sounds of the farm animals.
3.Why is the material of the food packet important?
A.Because customers want it to sound and look right.
B.Because customers enjoy looking at the different materials.
C.Because customers think the food is good if it makes the right sound.
D.Because customers don’t like noisy packets.
4.The passage mainly tells us .
A.sounds make a difference to the taste of food
B.the smell of food makes a difference to the taste of food
C.right music could help people love green vegetable
D.there is a connection between the sight of food and the taste of food
九年级英语阅读单选中等难度题查看答案及解析
What’s the first thing that you notice when passing your favorite restaurant? The smell of fresh pizza? Or the sight of your favorite desserts? Food that looks and smells good will probably taste good, but what about sound?
Scientists now believe that the taste of food can change when you hear different sounds, but it has to be the right sound. When you mm on a microwave with popcorn in it, it soon starts to pop. Do you think “That sounds tasty!”? Not really, you probably think it’s nearly ready. But when you smell it, you know it is delicious. Hearing the popcorn makes you think about it, but smelling it tells you that it tastes good. So what are the sounds to change the tastes of the things?
In an experiment in a fish restaurant, customers listened to the sound of the seaside while eating. Did it make a difference? Yes. Listening to the seaside seemed to improve the taste of the food. It was fresher and saltier. When the restaurant tried the same experiment with the sound of the farm animals, there was no difference in taste. The results are useful for restaurants. Perhaps they will use fewer unhealthy things like sugar and salt in food. With the right music or sounds, we won’t taste the difference.
Restaurants are also setting a connection between food and the sound that the packet makes. Pick up a packet (包装袋) of potato chips, what does it sound like? Experiments show that the packet making a right sound will make customers think the potato chips are fresher .So one restaurant recently changed the material that they used to make their potato chip packets. Another idea is that a list of music will begin to appear on food packets, so if you don’t like your green vegetables, the right music or sounds could help you learn to love them.
1.What can NOT attract people to enter a restaurant according to paragraph one?
A.Excellent cooking for pizza. B.Pretty food on the menu. C.Delicious smell of a dish.
2.What can you learn from the second paragraph?
A.Different sounds can change the taste of food.
B.The popping sound of popcorn means tasty popcorn.
C.With delicious smell, you know you can eat the popcorn.
3.If you run a seafood restaurant, you may play ________ to improve the taste of the food.
A.a list of pop music B.the sound of waves C.the sound of farm animals
4.The material of the food packet is important because the customers ________.
A.want it to look right
B.enjoy looking at the different materials
C.think the food is good if it makes the right sound
5.What could be the best title of the passage?
A.Right Sound, Good Taste
B.Enjoy Music While Eating
C.Magical Sounds of Packets
九年级英语阅读单选中等难度题查看答案及解析
When you think of robots, what is the first thing that comes to mind? Do you think of science fiction movies like Star Wars, where robots of all shapes and sizes are part of daily life? The word “robot” itself comes from a play written in 1920 by Karel Capek. In the play, people create robots to do some everyday tasks.
Today, most robots don’t look human. Modern robots take many forms and are good at many things, from sweeping the floors in your home to working in factories. They are even exploring the surface of the moon. But there is an interesting irony(讽刺) in the world of robotics which describes a surprising problem: What humans find easy is extremely complicated for a robot. However, what humans find difficult is pretty easy for a robot. For example, picking up clothes in a messy room is simple for people. But that kind of chore is very hard for a robot. Another example is the game of chess. People might find it difficult to win the game of chess all the time. But robots like Alpha-Go can be programmed to play it very well.
This is because robots are very good at doing things in controlled environments. However, moving through a room filled with random(随机的) objects is hard for robots, along with picking up objects of different shapes and sizes without damaging them. In short, it is very difficult for them to deal with certain types of variables.
It turns out that one of the most difficult things to improve in robots is their ability to control objects. Luckily, great progress is being made in the development of robots. On the one hand, exciting developments in making human-like hands and legs are underway. On the other hand, the biggest progress might result from using virtual learning(虚拟学习) to “teach” robots through computer simulations(模拟). In this way, robots can “guess” what to do without an order when they meet unfamiliar things in the real world.
Soon, robots may be able to do those things that humans find simple. That means big changes in what robots can do and how they can help us with daily tasks. Robots might make movies a reality.
1.What’s the purpose of the first paragraph?
A.To give an example.
B.To present the topic.
C.To explain what robots are.
D.To show how robots develop.
2.According to the passage, what might be difficult for robots?
A.Playing chess.
B.Washing the dishes.
C.Making cars in factories.
D.Gathering up clothes in a mess.
3.What’s the writer’s opinion about robots in the future?
A.They will cause further problems for people.
B.They will deal with new things depend on orders.
C.They can hardly develop until they look like human.
D.They can benefit people more by making improvements.
九年级英语阅读单选中等难度题查看答案及解析
根据短文内容，从短文后的A~F选项中选出适当的选项补全短文。
What is the first thing that comes to your mind when you hear the word”hero”? 1. There are onscreen heroes like the superheroes in Avengers(复仇者)，and also everyday heroes in our lives.
Whether they’re championship athletes, groundbreaking(开创性的)scientists, programmers changing the world with a keyboard, firefighters rushing into the burning building, artists creating the works of amazement, or a dog with a baby by his side, “hero” can be the word to describe them.
2.
In general, a hero is someone selfless, courageous and brave. These qualities drive heroes to help others in times of need, even if they are scared. You can count on them to be there for you if something bad happens.
“The people that we set up as heroes are people that generally go above and beyond the call of duty.3.” Nick Carden, a psychologist at the AAPHC Renaissance Center in the US said so.
However, why can some people be heroic? Nick Carden said, heroes are made. “They probably are people that have been influenced by and have been helped by or have been modeled or raised to have those as values.”
Common people—just like you and me—are heroes in their own way, simply just by doing their part for their families and communities. Cleaners, doctors, reporters, delivery workers, nurses, and bus drivers—the list goes on and on.4. And, sometimes, when there are emergencies, these common people show courage and bravery to help complete strangers in need.
Being a hero is the nature of human beings. “The decision to act heroically is a choice that mans or us will be called upon to make at some point in time. Heroism becomes something that seems in the range（范围）of possibilities for every person, perhaps inspiring more of us to answer that call.” heroism researchers Zeno Franco and Philip Zimbardo wrote in Great Good Magazine.5. Be courageous, honest, and a person with integrity(正直). Because, once you are your own hero, you can truly do anything you set your mind to.
A.These common people help keep order in our day-to-day lives.
B.Is it someone who wears a cape(披风）and can fly in the air?
C.Only in this way, you can be your own hero.
D.Most importantly, you should make an effort to be your own hero.
E.They do things that are outstanding.
F.But what makes a person a hero?
九年级英语补全短文6选5中等难度题查看答案及解析
When you walk into the small Australian town of Coober Pedy, you may be surprised by what you can see. It’s just barren (荒芜的) land there!
So why even call it a town? There are more than 4,000 people of 48 nationalities. However, all of the people live underground!
Coober Pedy was established(建立) in 1915, following the discovery of opals (猫眼石). The town is sometimes called the “opal capital of the world,” because it is the largest opal mining area in the world.
Due to a desert climate (沙漠气候), people came to realize that while working under the ground was easy, living above it was not. The solution was to move underground, by changing old mines into homes and establishing the world’s first and most likely, only underground town.
As years have gone by, the homes have become bigger. There are now also some hotels for tourists. They come from all over the world just to see this unusual town. Coober Pedy is probably best known for its unique style (独特风格)of underground living.
While the structures (结构)may be located underground, they are in no way worse than those that lie above. Not only do their walls have the color of beautiful red, but also the structures have all the modern equipment like walk-in closets, modern kitchens and televisions. And the town also has gift shops selling opal jewelry, a couple of museums and even a church!
Besides, Coober Pedy is also a favourite among filmmakers. And it has appeared in a series of movies such as Pitch Black, Red Planet and Opal Dream.
1. This passage tells us that Coober Pedy is a(an) ________ .
A .world famous person B. underground town
C. film-making company D. precious stone
2. We know from the passage that Coober Pedy ________ .
A.is a small town with 400 people
B. was established before the year 1915
C.is famous for its desert climate
D. was established after opals were discovered
3. People moved to live underground because________ .
A. there were large opal mines there
B. living above the ground was not easy
C. it was the opal capital of the world
D. it was the world’s first underground town
4. Which of the following statements is NOT true according to the passage?
A. People in Coober Pedy changed old mines into homes.
B. The underground homes have all the modern equipment.
C. Tourists come to Coober Pedy just to buy opal jewelry.
D. The underground homes are as good as those that lie above.
5. The best title for this passage might be ________ .
A.Opal Mining in Australia
B. The Desert Climate in Coober Pedy
C. Gift shops in Coober Pedy
D. World’s First Underground Town
九年级英语阅读理解中等难度题查看答案及解析
When talking about Australia, what is the first thing that comes to your mind? This summer, Chinese people will have the chance to closely experience one unusual symbol of Australian Aboriginal (原始的，土著的）culture--- bark painting.
Bark painting is thought to be one of the most famous Aboriginal art forms. Most bark paintings come from northern Australia. They are highly stylized, very colorful and beautiful. These paintings show the life and activities of local people.
With over. 2,000 works of art on bark, the National Museum of Australia (澳大利亚国家博物馆）takes place the world’s largest and richest collection of bark paintings. Earlier, this year,the museum decided to hold an exhibition (展览）tour of bark paintings in China. The exhibition will open at the National Museum of China in Beijing this July. It will later open in cities including Shanghai, Chengdu and Shenzhen It will also be the first time that the bark paintings are exhibited outside Australia.
Art is a very good belt to link people from different countries together. If your city is part of the tour, why not visit the exhibition and experience Australian Aboriginal culture with your families and friends during the holidays? This is a rare chance.
1.Most bark paintings come from__________
A. Eastern Australia B. Western Australia
C. Southern Australia D. Northern Australia
2.Which of the following is NOT a characteristic (特征）of bark painting?
A. Colorful. B. Boring. C. Stylized. D. Beautiful.
3.The exhibition of bark paintings will open at the National Museum of China in_________
A. Beijing B. Shanghai C. Chengdu D. Shenzhen
4.According to the passage, which of the following statements is NOT true?
A. Bark paintings are considered as one of the most famous Aboriginal art forms.
B. Bark paintings show the life and activities of the Aborigines.
C. The exhibition of bark paintings will later open in cities including Nanjing and Shanghai.
D. The bark paintings have never been exhibited outside Australia before.
5.From the passage, we can learn that_________can link people from different
countries together very well.
A. Music B. Sports C. Love D. Art
九年级英语阅读单选困难题查看答案及解析
Imagine that while walking through a park one day, you begin to notice strange things all around you. People in colorful clothes from centuries ago walk on the paths. A magician is doing amazing tricks. Musicians play strange music on strange instruments. Knights on horseback show their skills in riding competitions. The smell of roasting meat begins to make your mouth water. A pleasant voice shouts, “Good morrow!”
What is going on? Have you traveled back in time? In a way, yes. You have found yourself in the midst of a Renaissance fair! Since the 1960s, Renaissance fairs have grown in popularity in the US and Canada. Communities in at least 44 states and two Canadian provinces now hold annual Renaissance fairs. Over 200 fairs are held every year, with 40 in California alone. The first Renaissance fair was started in the 1960s by a school teacher in southern California named Phyllis Patterson. She wanted to give her students a real-life history experience, so she created the “Renaissance Faire” in her backyard. The rest, as they say, is history.
Since Renaissance fairs are “living history”, you might think they are designed to be mainly educational. It’s true that some people try to make the fairs as genuine as possible. However, for many others, the key word is entertainment. With all the musicians and magicians walking about, you will definitely be entertained. A renaissance fair will be a feast for your eyes and your ears, not to mention your stomach.
You can enjoy sampling the food and drink while watching parades and live animal displays. Browse through the booths and admire the artwork and handicrafts. You are sure to be both educated and entertained. If you’re wondering how to dress to attend a Renaissance fair, that’s up to you. Some people go all out and dress up in costumes. Others just go in their normal, everyday clothes. However you dress, you’re sure to be overwhelmed by the sights and sounds and smells of a Renaissance fair. And if you have ever wanted to travel back in time, here’s your chance.
1.What is the first paragraph about?
A.A chapter of a war novel. B.A sight of the local market.
C.A scene of Renaissance fairs. D.A slow walking in the park.
2.Why did Phyllis start a Renaissance fair?
A.To help her students become the master of history.
B.To allow her students to play in her backyard.
C.To give her students an experience of life.
D.To make her students experience history.
3.As well as educating, Renaissance fairs are intended for ________.
A.fun B.communication C.business D.adventure
4.The last paragraph suggests that ________.
A.you are taught to make art work
B.you are free to dress for the fairs
C.you have to look after live animals
D.you can enjoy food free of charge
5.The main idea of the passage is that ________.
A.Americans and Canadians like fairs more
B.attending Renaissance fairs is to be educated
C.Renaissance fairs are more popular than ever
D.California is where modern fairs were born
九年级英语阅读单选简单题查看答案及解析
Imagine that you are the first person ever to see Hawaii. What would be the first thing you would set foot on?
The beach, naturally. There are hundreds of miles of beaches on the twenty islands of Hawaii. These islands cover 1,600 miles and are about 2,300 miles west of California. Most of them are covered with fine white sand. They are thought to be among the finest beaches in the world.
Another wonderful thing about the beaches of Hawaii is the water temperature. The year-round average (平均)temperature of the water at the famous Waikiki Beach is 230C!
The same is true of air temperature. In fact, there are no real seasons in Hawaii. There is a difference of only two or three degrees between the hottest day of summer and the coldest day of winter. That’s why the Hawaiians don’t have a word for weather in their language.
Perhaps the nicest thing about Hawaiian beaches are the waves. The earliest settlers (定居者) in Hawaii, the Polynesians, quickly learned how much fun it was to ride the waves. They developed a sport which is now very popular on the islands called body surfing. You go out into the ocean, wait for a big wave to come towards you, jump on it, and ride it all the way to the beach.
Now imagine once again that you are the first person ever to set foot in Hawaii. What do you think would be the second beautiful thing you would notice?
Would it be those strange triangles (三角形状物) rising out of the water hundreds and hundreds of meters high? What are those beautiful things? They are volcanoes (火山), of course. These volcanoes are not just a part of the islands. They made the islands at first. Because of them the islands are still growing.
The most famous volcano on Hawaii is Mauna Loa. It is the world’s most active volcano. It has been erupting (喷发) for thousands of years. Even when it isn’t erupting, smoke comes out of the earth from a thousand little holes.
In 1950 Mauna Loa erupted for twenty-three days. That erupting produced the greatest amount of lava (熔岩) in modern history. In 1960 it erupted again. That time it added a kilometer of beach to the island. Because Mauna Loa has erupted so often, it has become the biggest (but not the tallest) mountain in the world.
These volcanoes could be dangerous to the population of Hawaii. In fact, Hilo, the second largest city in Hawaii, is built just under Mauna Loa. The volcano could erupt at any time. Most people believe that it will erupt sometime in the next twenty-five years. But the people of Hilo do not seem worried. They live with the danger as part of their lives.
1.According to the passage, what are the two most beautiful things in Hawaii?
A.Waves and cities.
B.Beaches and language.
C.Volcanoes and beaches.
D.Volcanoes and people.
2.Which is NOT the reason why the Hawaiians don’t have a word for weather in their language?
A. There are no real seasons in Hawaii.
B. The temperature of the water at one of the beaches is always 230C.
C. The Hawaiians feel almost the same in the hottest day and coldest day.
D. There is not much difference in air temperature all the year round in Hawaii.
3.It can be inferred that _________ according to the passage.
A. volcanoes are more active because the area of the island is enlarging
B.the visitors to Hawaii can probably see more than one active volcano
C.Mauna Loa is the tallest mountain in the world because it has erupted so often
D.people in Hilo are sure that more visitors will come because of volcanoes
九年级英语阅读理解中等难度题查看答案及解析
Imagine that you are the first person ever to see Hawaii. What would be the first thing you would set foot on?
The beach, naturally. There are hundreds of miles of beaches on the twenty islands of Hawaii. These islands cover 1,600 miles and are about 2,300 miles west of California. Most of them are covered with fine white sand. They are thought to be among the finest beaches in the world.
Another wonderful thing about the beaches of Hawaii is the water temperature. The year-round average（平均） temperature of the water at the famous Waikiki Beach is 23℃!
The same is true of air temperature. In fact, there are no real seasons in Hawaii. There is a difference of only two or three degrees between the hottest day of summer and the coldest day of winter. That's why the Hawaiians don't have a word for weather in their language.
Perhaps the nicest thing about Hawaiian beaches are the waves. The earliest settlers（定居者） in Hawaii, the Polynesians, quickly learned how much fun it was to ride the waves. They developed a sport which is now very popular on the islands called body surfing. You go out into the ocean, wait for a big wave to come towards you, jump on it, and ride it all the way to the beach.
Now imagine once again that you are the first person ever to set foot in Hawaii. What do you think would be the second beautiful thing you would notice?
Would it be those strange triangles（三角形状物） rising out of the water hundreds and hundreds of meters high? What are those beautiful things? They are volcanoes（火山）, of course. These volcanoes are not just a part of the islands. They made the islands at first. Because of them the islands are still growing.
The most famous volcano on Hawaii is Mauna Loa. It is the world's most active volcano. It has been erupting（喷发） for thousands of years. Even when it isn't erupting, smoke comes out of the earth from a thousand little holes.
In 1950 Mauna Loa erupted for twenty-three days. That erupting produced the greatest amount of lava（熔岩） in modern history. In 1960 it erupted again. That time it added a kilometer of beach to the island. Because Mauna Loa has erupted so often, it has become the biggest（but not the tallest） mountain in the world.
These volcanoes could be dangerous to the population of Hawaii. In fact, Hilo, the second largest city in Hawaii, is built just under Manna Loa. The volcano could erupt at any time. Most people believe that it will erupt sometime in the next twenty-five years. But the people of Hilo do not seem worried. They live with the danger as part of their lives.
1.According to the passage, what are the two most beautiful things in Hawaii?
A．Waves and cities. B．Beaches and language.
C．Volcanoes and beaches. D．Volcanoes and people.
2.Which is NOT the reason why the Hawaiians don't have a word for weather in their language?
A．There are no real seasons in Hawaii.
B．The temperature of the water at one of the beaches is always 23℃.
C．The Hawaiians feel almost the same in the hottest day and coldest day.
D．There is not much difference in air temperature all the year round in Hawaii.
3.What should be the meaning of “body surfing”?
A．Riding waves. B．Body-building.
C．Sea bathing. D．Jumping into the sea.
4.It can be inferred that ________ according to the passage.
A．volcanoes are more active because the area of the island is enlarging
B．the visitors to Hawaii can probably see more than one active volcano
C．Mauna Loa is the tallest mountain in the world because it has erupted so often
D．people in Hilo are sure that more visitors will come because of volcanoes
九年级英语阅读理解中等难度题查看答案及解析
What is the first thing you want to do when you see someone yawn（打哈欠）？You want to yawn, too! Yawning is contagious.
Scientists have found that all people yawn. Babies start to yawn even before they are born. The earliest yawn takes place when a baby is still inside its mother. When young children are about one year old, they start to yawn when they see others yawning. That’s why scientists seem to think yawning is contagious.
It’s no secret that yawning is contagious, but why do we yawn? Well, scientists are not really sure.
Some think we yawn because we feel bored. Recently scientists studied two groups of students between the ages of 17 and 19. One group watched music videos, and the other watched a boring color test. Scientists compared the numbers of their yawns and found that the color test group yawned more times than the video group.
Another reason for yawning has to do with breathing. Some scientists believe that when we are bored or tired, we breathe more slowly. As our breathing slows down, we cannot get rid of （去除）enough carbon dioxide, our bodies will tell the brains（大脑）to breathe deeply. The result is a big yawn.
In 2007, scientists suggested a new reason. They said that the reason why people yawned was to cool down their brains. These scientists found that people who were warmer than others yawned more often.
Scientists are still trying to find out why yawning happens and why it is so contagious. But they are only sure that when one person yawns, almost everyone else nearby wants to yawn, too.
1.The underlined word “contagious” in Paragraph 1 means _________.
A. helpful to our health
B. passing from one person to another
C. hard to understand
D. getting into one trouble after another
2.According to the scientists, people start to yawn when they are _______.
A. born B. one year old C. 17 or 19 years old D. inside their mothers
3.Which of the following are the possible reasons for yawning according to the passage?
①People yawn because they are bored
②People yawn to catch others’ attention
③People yawn to cool down their brains
④People yawn to get rid of carbon dioxide.
A. ①②③ B.②③④ C.①②④ D.①③④
4.We can probably read this passage in a ____________
A. storybook B. travel guidebook C. movie poster D. science magazine
九年级英语阅读理解中等难度题查看答案及解析