We all know that water is tasteless. But it happens from time to time: you pick up the bottle of water you didn’t finish yesterday, and it tastes strange. Most often, you tend to drop the bottle in the trash bin, believing that the water has gone bad. But is it true?
According to Time, of course not, taste has little to do with quality of water.
According to Time, when water is exposed to the air for 12 hours, carbon dioxide interacts with the H2O in the water, and the pH value lowers slightly. As a result, the water has a different taste.
“But it’s most likely safe to drink,” Norwegian expert Truls Krogh told Science Nordic. “If the water is covered and of good quality to start with, in principle it can last a thousand years. That’s because when water is fresh, it contains little organic matter. As long as water is held in clean glasses or bottles, no pollutants will enter it to harm our health.”
People in countries like the US, the UK and Australia usually drink tap water. According to Time, if tap water is drunk within six months, the chlorine (氯气) in the water will be enough to kill any bacteria and keep it safe to drink.
However, there are also some exceptions. If you accidentally put your fingers into water or store water in unclean containers day after day, microorganism (微生物) will enter the water.
With the help of surrounding temperature, and sunlight streaming through windows, these microorganisms multiply quickly. Sooner or later, the water will be in the charge of the unfriendly bacteria. And if you drink the water too often, then you’re more likely to be ill.
And what about water in plastic bottles? Heat and plastic are a bad combination, US researcher Kellogg Schwab stresses. When plastic bottles are used at high temperatures, they produce a chemical called BPA. BPA is something that affects hormones (荷尔蒙) and research has tentatively linked it to “several health damage, including heart disease and cancer”, Time reported.
Schwab suggests replacing disposable (一次性的) plastic bottles with the refillable containers made of metal or glass to deal with BPA.
1.The purpose of the first paragraph is to ________________.
A. show an example B. draw a conclusion
C. analyze a phenomenon D. introduce a topic
2.Which of the following may Truls Krogh agree?
A. If the water tastes different, we shouldn’t drink it.
B. The water held in a clean container is likely safe to drink.
C. Although kept fresh, water may still have much organic matter.
D. Covered water can last for a thousand years.
3.What can we infer from the passage?
A. BPA does little harm to our health.
B. Tap water is always safe to drink.
C. Microorganisms are easy to produce in the heat.
D. Disposable plastic bottles have been banned already.
4.What can be the best title of the passage?
A. Why Water is Tasteless B. How to Get Clean Water
C. Does Water Really Go Bad? D. Learn to Protect Water
高二英语阅读理解困难题
We all know that water is tasteless. But it happens from time to time: you pick up the bottle of water you didn’t finish yesterday, and it tastes strange. Most often, you tend to drop the bottle in the trash bin, believing that the water has gone bad. But is it true?
According to Time, of course not, taste has little to do with quality of water.
According to Time, when water is exposed to the air for 12 hours, carbon dioxide interacts with the H2O in the water, and the pH value lowers slightly. As a result, the water has a different taste.
“But it’s most likely safe to drink,” Norwegian expert Truls Krogh told Science Nordic. “If the water is covered and of good quality to start with, in principle it can last a thousand years. That’s because when water is fresh, it contains little organic matter. As long as water is held in clean glasses or bottles, no pollutants will enter it to harm our health.”
People in countries like the US, the UK and Australia usually drink tap water. According to Time, if tap water is drunk within six months, the chlorine (氯气) in the water will be enough to kill any bacteria and keep it safe to drink.
However, there are also some exceptions. If you accidentally put your fingers into water or store water in unclean containers day after day, microorganism (微生物) will enter the water.
With the help of surrounding temperature, and sunlight streaming through windows, these microorganisms multiply quickly. Sooner or later, the water will be in the charge of the unfriendly bacteria. And if you drink the water too often, then you’re more likely to be ill.
And what about water in plastic bottles? Heat and plastic are a bad combination, US researcher Kellogg Schwab stresses. When plastic bottles are used at high temperatures, they produce a chemical called BPA. BPA is something that affects hormones (荷尔蒙) and research has tentatively linked it to “several health damage, including heart disease and cancer”, Time reported.
Schwab suggests replacing disposable (一次性的) plastic bottles with the refillable containers made of metal or glass to deal with BPA.
1.The purpose of the first paragraph is to ________________.
A. show an example B. draw a conclusion
C. analyze a phenomenon D. introduce a topic
2.Which of the following may Truls Krogh agree?
A. If the water tastes different, we shouldn’t drink it.
B. The water held in a clean container is likely safe to drink.
C. Although kept fresh, water may still have much organic matter.
D. Covered water can last for a thousand years.
3.What can we infer from the passage?
A. BPA does little harm to our health.
B. Tap water is always safe to drink.
C. Microorganisms are easy to produce in the heat.
D. Disposable plastic bottles have been banned already.
4.What can be the best title of the passage?
A. Why Water is Tasteless B. How to Get Clean Water
C. Does Water Really Go Bad? D. Learn to Protect Water
高二英语阅读理解困难题查看答案及解析
阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。
We all know that fish live in the water. But there is a kind of fish living in the desert. This kind of fish is called the lungfish. The lungfish is a type of fresh water fish best known for its 1. （able）to live on land, without water, for months on end, and sometimes even for years.
As its name suggests, the lungfish has a highly evolved breathing system 2. can take oxygen straight from the air, just like land animals do. While they still live in the water, the lungfish needs to 3. （regular）come up to the surface for air. And 4. is astonishing is that these fish can even die if they are in the water for a long time. Therefore, they need to avoid 5. （put）underwater.
When in the water, the lungfish behaves like other 6. （type）of fish, swimming and eating small fish at 7. bottom of ponds and lakes. But when the dry season hits, the lungfish will bury itself deep into the mud, where it secrets mucus（分泌粘液）out of its skin that hardens to form a protective cocoon（茧）around it. Only the mouth 8. （leave）for breathing.
Lungfish is one of the most ancient bony fish 9. （discover）on the earth today. They are very much like the fish that 10. （live）two hundred million years ago. And now lungfish is found only in Africa, South America and Australia.
高二英语语法填空中等难度题查看答案及解析
Of all the things we eat and drink, water is the most important. Not all people realize this, but it is quite true. The human body can live without food for a long time, but two or three days without water usually result in death.
Many people do not understand how much water the human body needs, but many people do not drink enough, especially in the hot weather. Most people drink when they are thirsty but often need more water after exercises.
65 to 70 percent of the human body is water. Water is important in several different ways. Most people need five to seven litres of water every day, but we need not drink this amount because a lot comes from the food we have. If we don’t have enough water, however, we will feel tired and many become ill. Do you know what the best drink is? Yes, you are right. Cold water!
1.Do most people drink five litres of water every day?
A. Yes, because water is the most important
B. No, because what we eat contains water
C. Yes, because we can’t live without water
D. No, because we are not thirsty
2.How much water is there in the human body?
A. About three fourths of the human body is water.
B. Nearly a half of the human body is water.
C. Less than a half of the human body is water.
D. Almost one fourth of the human body is water.
3.When do we need more water?
A. In cold weather or after exercises.
B. In hot weather or after exercises.
C. Before breakfast, lunch and supper.
D. When we feel tired or become ill.
4.Which of the following is not right?
A. Cold water is the best drink.
B. Few people understand how much water the human body needs.
C. Not all the people realize water is the most important.
D. When we feel tired or become ill, we never need any water.
高二英语阅读理解中等难度题查看答案及解析
No one knows why we sleep, but it’s certain that we need to. People who are prevented from sleeping begin to suffer obvious effects after a few days—they think less clearly, and they fall asleep during the working hours; some may have hallucinations(幻觉).
There are no rules about sleep. Generally speaking, grown-ups sleep about 7 and a half hours each night and probably more than 60 per cent get between seven and eight hours. But perhaps eight per cent are quite happy with 5 hours or less, and four per cent or so find that they want ten hours or more. If you feel all right, you’re probably getting enough sleep. The important thing is not to worry how much other people get—their needs may be different. Exercise doesn’t seem to increase the need for sleep—office workers, for example, sleep for about as long as people doing physically active work.
Children sleep more than grown-ups—perhaps 14 to 18 hours soon after birth, going down to grown-up levels by early teenage. Sleep patterns also tend(倾向) to be different in the elderly, who may sleep less at night than they did when younger, find sleep getting more broken, and often make it a rule to sleep during the daytime.
1.According to the passage, some people are unable to think clearly because ___________ .
A. they have hallucinations
B. they feel sleepy during the working hours
C. they don’t have enough sleep
D. they are certain to be kept from going to bed
2.Which of the following is TRUE?
A. All grown-ups must have at least eight-hour sleep.
B. Most of grown-ups sleep for seven or eight hours.
C. Quite a few people need only 5 hours or less for them to sleep.
D. No grown-ups sleep more than ten hours.
3.Whether you have got enough sleep is judged by__________.
A. how many hours you have slept
B. how many hours you need to sleep
C. whether you do exercise and physical work
D. whether you feel fresh and energetic
4.According to the passage, a boy of 14 years old sleeps__________.
A. as long hours as a grown-up
B. much longer hours than a grown-up
C. for 14 hours each night
D. for less than 8 hours per night
高二英语阅读理解中等难度题查看答案及解析
Maybe it is true that we do not know what we have got until we lose it, but it is also true that we do not know what we have been missing until it arrives.
It takes an hour to like someone, and a day to love someone, but it takes a lifetime to forget someone. Giving someone all your love is never an assurance that they will love you back. Do not expect love in return; but if it does not, be content it has grown in yours. Do not rely on one’s appearance; it can trick you. Do not rely on wealth; even that fades away. Rely on someone who makes you smile, because it takes only a smile to make a dark day seem bright.
There are moments in life when you miss someone so much that you just want to pick them from your dreams and hug them. Dream what you want to dream; go where you want to go; be what you want to be, because you have only one life and one chance to do all the things you want to do.
The brightest future will always be based on a forgotten past. You cannot go on well in life until you let your past failures and heartaches go off. May you have enough happiness to make you sweet, enough trails to make you strong, enough sorrow to keep you human, enough hope to make you happy. The happiest of people do not necessarily have the best of everything; they just make the most of everything that comes along their way. Happiness waits for those who cry, those appreciate the importance of people who have touched their lives. Always put yourself in others’ shoes. If you feel that it hurts you, it probably hurts the other person, too.
When you were born, you were crying and everyone around you was smiling. Live your life so that when you die, you are the one who is smiling and everyone around you is crying.
1.In this passage, the writer wants to tell us ______.
A. what to do in our life
B. where to go with other persons
C. how to treat our life
D. how to get on well with other persons
2.Which of the following statements is true according to the passage?
A. If you give someone your love, you are sure to receive love in return.
B. We often don’t know what we have lost until it happens someday.
C. It is wise not to rely on anybody because you are likely to be cheated.
D. If it takes you a short time to love someone, you will easily forget the person.
3.If you put yourself in another person’s position, ______.
A. you shouldn’t do what will hurt other people
B. you should put on other people’s shoes
C. you should believe in other people
D. you should depend on your imagination
4.In the last paragraph the writer is actually telling us that a person in the world should be one who ______.
A. can accept the suggestions made by others
B. can live happily and forget the past
C. does good to other people and is respected and loved by them
D. has made a lot of money for himself before he dies
高二英语阅读理解困难题查看答案及解析
Maybe it is true that we do not know what we have got until we lose it, but it is also true that we do not know what we have been missing until it arrives.
It takes an hour to like someone, and a day to love someone, but it takes a lifetime to forget someone. Giving someone all your love is never an assurance that they will love you back. Do not expect love in return; but if it does not, be content it has grown in yours. Do not rely on one’s appearance; it can trick you. Do not rely on wealth; even that fades away. Rely on someone who makes you smile, because it takes only a smile to make a dark day seem bright.
There are moments in life when you miss someone so much that you just want to pick them from your dreams and hug them. Dream what you want to dream; go where you want to go; be what you want to be, because you have only one life and one chance to do all the things you want to do.
The brightest future will always be based on a forgotten past. You cannot go on well in life until you let your past failures and heartaches go off. May you have enough happiness to make you sweet, enough trails to make you strong, enough sorrow to keep you human, enough hope to make you happy. The happiest of people do not necessarily have the best of everything; they just make the most of everything that comes along their way. Happiness waits for those who cry, those appreciate the importance of people who have touched their lives. Always put yourself in others’ shoes. If you feel that it hurts you, it probably hurts the other person, too.
When you were born, you were crying and everyone around you was smiling. Live your life so that when you die, you are the one who is smiling and everyone around you is crying.
1.In this passage, the writer wants to tell us ______.
A. what to do in our life
B. where to go with other persons
C. how to treat our life
D. how to get on well with other persons
2.Which of the following statements is true according to the passage?
A. If you give someone your love, you are sure to receive love in return.
B. We often don’t know what we have lost until it happens someday.
C. It is wise not to rely on anybody because you are likely to be cheated.
D. If it takes you a short time to love someone, you will easily forget the person.
3.If you put yourself in another person’s position, ______.
A. you shouldn’t do what will hurt other people
B. you should put on other people’s shoes
C. you should believe in other people
D. you should depend on your imagination
4.In the last paragraph the writer is actually telling us that a person in the world should be one who ______.
A. can accept the suggestions made by others
B. can live happily and forget the past
C. does good to other people and is respected and loved by them
D. has made a lot of money for himself before he dies
高二英语阅读理解中等难度题查看答案及解析
Maybe it is true that we do not know what we have got until we lose it, but it is also true that we do not know what we have been missing until it arrives. Giving someone all your love is never an assurance that they will love you back. Do not expect love in return; but if it does not, be content it grows in yours.
It takes an hour to like someone, and a day to love someone, but it takes a lifetime to forget someone. Do not rely on one's appearance, it can deceive. Do not rely on wealth, even that fades away. Rely on someone who makes you smile, because it takes only a smile to make a dark day seem bright.
There are moments in life when you miss someone so much that you just want to pick them from your dreams and hug them.
Dream what you want to dream; go where you want to go; be what you want to be, because you have only one life and one chance to do all the things you want to do.
May you have enough happiness to make you sweet, enough trials to make you strong, enough sorrow to keep you human, enough hope to make you happy.
Always put yourself in others' shoes. If you feel that it hurts you, it probably hurts the other person, too.
The happiest of people do not necessarily gave the best of everything; they just make the most of everything that comes along their way. Happiness waits for those who cry, those who have been hurt, those who have searched, and those who have tired, for only they can appreciate the importance of people who have touched their lives.
The brightest future will always be based on a forgotten past. You cannot go on well in life until you let your past failures and heartaches go off.
When you were born, you were crying and everyone around you was smiling. Live your life so that when you die, you are the one who is smiling and everyone around you is crying.
1.The writer thinks the trouble with some people is that they __________.
A. always take a long view about problems
B. look at problems all-sidedly
C. can be good at doing with problems
D. deal with problems one-sidedly
2.Which of the following statements is true according to the passage?
A. We often don't know what we have lost until it happens.
B. If it takes you an hour to love someone, you will easily forget her.
C. If you give someone your love, you are sure that she will give her love to you in return.
D. If someone accepts your love and he doesn’t give you his love in return, you should be angry with him.
3.If you put yourself in another's position, ___________.
A. you should depend on wealth
B. you shouldn't do those things that will hurt you and other people
C. you will do what you want to do however dangerous it is to people
D. you should depend on other people
4.In the last paragraph of the passage, the writer is actually telling us that a man in the world should be one who __________.
A. can accept the suggestions made by others
B. can live happily and forget the past
C. does good for the people and is respected by them
D. has made a lot of money for himself when he dies
高二英语阅读理解中等难度题查看答案及解析
Maybe it is true that we do not know what we have got until we lose it, but it is also true that we do not know what we have been missing until it arrives．
It takes an hour to like someone, and a day to love someone, but it takes a lifetime to forget someone．Giving someone all your love is never an assurance that they will love you back．Do not expect love in return; but if it does not, be content it has grown in yours．Do not rely on one’s appearance; it can trick you．Do not rely on wealth; even that fades away．Rely on someone who makes you smile, because it takes only a smile to make a dark day seem bright．
There are moments in life when you miss someone so much that you just want to pick them from your dreams and hug them．Dream what you want to dream; go where you want to go; be what you want to be, because you have only one life and one chance to do all the things you want to do．
The brightest future will always be based on a forgotten past．You cannot go on well in life until you let your past failures and heartaches go off．May you have enough happiness to make you sweet, enough trails to make you strong, enough sorrow to keep you human, enough hope to make you happy．The happiest of people do not necessarily have the best of everything; they just make the most of everything that comes along their way．Happiness waits for those who cry, those appreciate the importance of people who have touched their lives．Always put yourself in others’ shoes．If you feel that it hurts you, it probably hurts the other person, too．
When you were born, you were crying and everyone around you was smiling．Live your life so that when you die, you are the one who is smiling and everyone around you is crying．
1.In this passage, the writer wants to tell us ______．
A．where to go with other persons
B．how to treat our life
C．how to get on well with other persons
D．what to do in our life
2.Which of the following statements is true according to the passage?
A．If it takes you a short time to love someone, you will easily forget the person．
B．If you give someone your love, you are sure to receive love in return．
C．It is wise not to rely on anybody because you are likely to be deceived．
D．We often don’t know what we have lost until it comes someday．
3.If you put yourself in another person’s position, ______．
A．you should depend on your imagination
B．you should put on other people’s shoes
C．you shouldn’t do what will hurt other people
D．you should believe in other people
4.In the last paragraph the writer is actually telling us that a person in the world should be one who ______．
A．has made a lot of money for himself before he dies
B．can live happily and forget the past
C．does good for other people and is respected and loved by them
D．can accept the suggestions made by others
高二英语阅读理解中等难度题查看答案及解析
We all know how important human life is—it’s priceless. It doesn’t matter where you are from or what the color of your skins is—all people are human beings. Firstly, we can tell you that the lives of your relatives could depend on your ability to give first aid. If you think highly of human’s life, this website is for you! Here you can find information about first aid.
The very first thing that you should do when you see an accident is to evaluate the situation and prevent further dangerous incidents. First of all, you have to recognize what has happened and what the dangers to rescuers and victims are. Think about how to take care of the victims.
Helping usually takes place in very difficult conditions and injuries can be very bad. Therefore, you cannot be too afraid of making mistakes to help. Sometimes you have to face the fact that regardless of your actions and your efforts the victim’s condition might not improve—he or she could even die. In some cases even professional medical aid may not succeed. If you have done everything you think you should do, you shouldn’t feel guilty.
Do not expose yourself to danger. Giving first aid can be dangerous. While trying to help a victim, do not forget about your own safety. If something happens to you, you won’t be able to help anyone.
Call for help after you find out the condition of a victim. But remember if a victim faints due to breathing failure caused by drowning, choking or poisoning, you should first take actions that help to bring back the heart beat and breathing. While calling, talk shortly but clearly. Always provide the following information: the location of the accident, the kind of accident, the number of the injured and your full name and phone number and so on.
1.The passage is probably taken from _________.
A. a newspaper B. the Internet C. a textbook D. a guide book
2.The underlined word “ evaluate” in Paragraph 2 is closest in meaning to _______.
A. leave B. protect C. avoid D. judge
3. What’s the main idea of Paragraph 3?
A. You should learn some professional knowledge about first aid.
B. You shouldn’t feel guilty if you don’t know about first aid.
C. Try your best to give first aid and don’t be afraid of making mistakes
D. Don’t make mistakes when you are giving first aid.
4.The author thinks that helping a victim can be ____________.
A. risky B. shocking C. exciting D. boring
5.It can be inferred from the passage that __________.
A. young people must learn how to give first aid
B. you should forget about your own safety while giving first aid.
C. when you see an accident you should do nothing but call the police.
D. when calling for help you should give all relevant details.
高二英语阅读理解中等难度题查看答案及解析
We all know cameras. But have you heard of Google’s new camera? It is a small, smart device, called Clips. It comes with a case that has a clip (夹子), but it’s not designed to be worn on your clothing. Most interestingly, it uses artificial intelligence to take photography out of your hands so it can capture moments on its own.
This roughly 2-inch by 2-inch camera, with a three-hour battery life and Gorilla Glass for toughness, is intended for candid moments, like when a child does something cute that may happen too quickly for you to pull out your smart phone.
Onboard the Clips device, it uses machine learning algorithms (计算程序) to help capture scenes. Those algorithms include face recognition. “Once it learns that there’s a face you see frequently, it’ll try to get nice photos of those faces,” said Juston Payne, the device’s product manager. And they also want it to recognize facial expressions, which involved “training it to know what happiness looks like”. The Google team also trained it to recognize what not to shoot—like when a child’s hand is over the lens, or if it is tossed in a dark purse.
The only way to see the images is by connecting the camera with your phone, as it has no screen for viewing or editing.
Did people think it was strange? Yes, Payne admitted. But they said they addressed that by making it obvious what it is. A green light on the front signals that the device is on. Besides, unlike a camera meant to monitor your home, it is not connected to the Internet.
“This product is only possible because of the way that technology has advanced,” Payne said. It was only in the past year or so that they could squeeze the technology down into a device this size. Going forward, we’re likely to get more assistance from the artificial intelligence packed into our apps and gadgets.
1.What is the most outstanding feature of Clips?
A. It is equipped with tough glass.
B. It enables easy Internet access.
C. It allows of hands-free photography.
D. It can be worn on your clothing.
2.What does the underlined word “candid” in Paragraph 2 probably mean?
A. Brief. B. Touching.
C. Unforgettable. D. Embarrassing.
3.What makes Clips a reality according to Juston Payne?
A. The popularity of the Internet.
B. The advance in technology.
C. The rise of the smart phone industry.
D. The reduction in the price of lens.
4.What is the best title for the text?
A. An Alternative Way to Photograph
B. New Gadgets in the Age of Apps
C. Artificial Intelligence in Everyday Life
D. A New Digital Camera from Google
高二英语阅读理解困难题查看答案及解析