. It is only when we cannot see clearly _____...

. It is only when we cannot see clearly _____ we come to see ______ important our eyes are.

高二英语单项填空简单题查看答案及解析

It is only when we cannot see clearly _____ we come to see ______ important our eyes are.

A. that; what               B. which; what             C. that; how                 D. which; how

高二英语单项填空困难题查看答案及解析

When we see well, we do not think about our eyes very often. It is only when we cannot see perfectly that we realize how important our eyes are.

People who are near-sighted can only see things that are very close to their eyes. Everything else seems ­­blurry. Many people who do a lot of work, such as writing, reading and sewing become near-sighted. People who are far-sighted suffer from just the opposite problem. They can see things that are far away, but they have difficulty in reading a book unless they hold it at arm’s length. If they want to do much reading, they must get glasses, too.

Other people do not see clearly because their eyes are not exactly the right shape. They have what is called astigmatism (散光). This, too, can be corrected by glasses. Some people’s eyes become cloudy because of cataracts (白内障). Long ago these people often became blind. Now, however, it is possible to operate on the cataracts and remove them.

Having two good eyes is important for judging distances. Each eye sees things from a slightly different angle. To prove this to yourself, look at an object out of one eye; then look at the same object out of your other eye. You will find the object’s relation to the background and other things around it has changed. The difference between these two different eye views helps us to judge how far away an object is. People who have only one eye cannot judge distances as people with two eyes.

1.We should take good care of our eyes　　 .

A.only when we can see well

B.only when we cannot see perfectly

C.even if we can see well

D.only when we realize how important our eyes are

2.The underlined word blurry in the second paragraph probably means　　 .

A.obvious B.possible C.clear D.unclear

3.Having two eyes instead of one is particularly useful for　　 .

A.seeing at night

B.seeing objects far away

C.looking over a wide area

D.judging distances

4.People who suffer from astigmatism have　　 .

A.one eye bigger than the other

B.eyes that are not exactly the right shape

C.a difficulty that can be corrected by an operation

D.an eye difficulty that cannot be corrected by glasses

高二英语阅读理解中等难度题查看答案及解析

When we can see well, we do not think about our eyes often. It is only when we can not see perfectly that we come to see how important our eyes are.

People who are nearsighted can only see things that are very close to their eyes. Many people who do a lot of close work, such as writing and reading, become nearsighted. Then they have to wear glasses in order to see distant things clearly.

People who are farsighted face just the opposite problem. They can see things that are far away, but they have difficulty reading a book unless they hold it at arm’s length. If they want to do much reading, they must get glasses too.

Other people do not see clearly because their eyes are not exactly the right shape. This, too, can be corrected by glasses. Some people’s eyes become cloudy because of cataracts（白内障）. Long ago these people often became blind. Now, however, it is possible to operate on the cataracts and remove them.

When night falls, colors become fainter（不清楚） to the eyes and finally disappear. After your eyes have grown used to the dark, you can see better if you use the side of your eyes rather than the centers. Sometimes, after dark, you see a small thing to one side of you, which seems to disappear if you turn your head in its direction. This is because when you turn your head, you are looking at the thing too directly. Men on guard duty sometimes think they see something moving to one side of them. When they turn to look straight at it, they can not see it any more, and they believe they were mistaken. However, this mistake happens because the center of the eye, which is very sensitive in daylight, is not as sensitive as the sides of the eye after dark.

1.We don’t know that our eyes are of great importance until ________.

A. we think about our eyes           B. we cannot see clearly

C. we wear glasses                 D. we have to do much reading

2.According to the passage, a ________ is more likely to be nearsighted.

A. student    B. runner    C. guard    D. worker

3. People who are farsighted ________ .

A. cannot do a lot of close work without glasses

B. can only see things that are very close to their eyes

C. have difficulty reading a book if they hold it at arm’s length

D. have the same problem as the nearsighted people

4. To see a small thing at night, it is better to look ________ .

A. with wide open eyes             B. with half shut or narrowed eyes

C. straight at it                    D. in a slightly different direction

高二英语阅读理解简单题查看答案及解析

_____, please come to see me.

A．When it convenient B．When is convenient  C．When convenient   D．Convenient

高二英语单项填空中等难度题查看答案及解析

It is common and usual to see people freak out when they face challenges in their life. We all pass in different life problems and challenges. No one is free of life problems. Only a dead man faces no problem. As long as you are alive, challenges are everywhere.

How do you face problems and challenges in your life? Problems and challenges are the building blocks of your personality. They make you who you are. Besides, whether what happened in your life builds or destructs（破坏、毁灭）you depends on how you look at it. If you take your problems as troubles, they will be troubles and may cause destruction. If you take them as constructive (有建设性的）tools, you are going to be built up on them.

Problems are everywhere. No one can avoid them. And they are good too. They open up a different look and opportunity if you are willing to see. When you face troubles, do not frustrate or freak out. Just cool yourself to think in a different direction. Think in a positive way. Every problem has its own good as well as bad sides. Focus on the good one. Look at the bright side.

Besides, there is always a good person, perhaps your mom or dad, or one of your friends, right beside you who can turn everything into your best if you are willing to turn to them. No matter what happens, they will be there to help you. Trust them and they will never let you down. All you need to know is that you are loved wherever you are.

1.What’s the meaning of the underlined phrase “freak out” in Paragraph 1?

A. Feel shy.    B. Stay calm.

C. Keep silent.    D. Feel upset.

2.In Paragraph 2, the writer implies that ______.

A. problems cause troubles

B. attitude is everything

C. challenges can be avoided

D. personalities are built on failures

3.What’s the writer’s purpose to write the passage?

A. To encourage.　　 　　　　　　 B. To compare.

C. To prove.　　　　　　　　　　　　 D. To explain.

4.What can be the best title of the passage?

A. How to Avoid Problems

B. Challenges Are Everywhere

C. Face Your Challenges Bravely

D. You Are Loved Wherever You Are

高二英语阅读理解中等难度题查看答案及解析

It was very lucky to see the "Monster of Lake Tianchi", ______ we didn't see it clearly.

A. still        B. however        C. now that        D. though

高二英语单项填空中等难度题查看答案及解析

请认真阅读下列短文，并根据所读内容在文章后表格中填入最恰当的单词。

注意：每空一词

When it comes to making sure our food is safe, we are often advised to wash vegetables and fruits before eating. This has been a good method recommended by food safety experts. However, is this way of cleaning also useful for raw meat? No! The US Departement of Agriculture hs been warning people against washing raw meat before cooking , as it can do more harm than good to our health. Then, why do people want to wash raw meat? Here are some answers.

Some people complain that the unpleasant smell coming from the chicken forces them to wash it.Well, this might never happen if you have bought it from a reliable source. Also, many people say that it helps to get rid of the sliminess(粘连) of the store-bought chicken. And others just want to remove the bacteria from it. But the idea that washing meat helps to clean the chicken is only partly true. This is because some of the bacteria remain firm on the surface, though the meat has been washed several times.

In fact, the surface of the chicken is often polluted with a lot of bacteria. So, when you wash the meat under the tap, it can lead to　 the bacteria being removed from the meat’s surface, and spreading all over the kitchen. These small infected(受到污染的)water drops can move as far as half a meter. So if you have kept any ready-to-serve dishes on your kitchen top, they are likely to get polluted, and may cause food poisoning if they are eaten.

Of course, if you are really serious about food safety, make sure that the chicken is cooked in a proper way. Eating undercooked meat is another common cause of food poisoning. Bacteria can be killed by the heat of above 70℃. This is the best way to get the bacteria present on raw meat destroyed.

In conclusion, food safety is important but that doesn’t mean that you have to wash raw meat with running water, which carries a lot of health risks.

高二英语其他题困难题查看答案及解析

When we look at the sky and see a bright light moving quickly across it or coming towards the earth, we talk about seeing a “shooting star” or a “falling star”. These moving lights are not, in fact, stars at all. They are small pieces of matter from outer space, which burn up as they enter the Earth’s atmosphere. The correct name of them is meteoroids. Any pieces that make it to the Earth’s surface without completely burning up are known as meteorites. A meteor is actually the name given to the light we see when a meteoroid is burning up.

When a meteorite hits the Earth at speeds between 11 and 72 kilometers a second, it can do amazing damage. A very large meteorite could knock the earth out of its orbit. If this happened, all life on Earth would probably become extinct（灭绝）. The path we follow around the Sun would change and as a result the Earth would become either much hotter or much colder. This change in temperature would affect sea levels and the amount of water in rivers. There would either be huge floods, which would cover most of the land with water, or the oceans would dry up and there would be a drought, which means a long period of time without rain. Either way, nothing could survive. If a large meteorite landed in the sea it would almost certainly cause tsunamis, which would race towards the land, destroying everything in their paths.

Although it is unlikely the Earth will be struck by a meteorite large enough to do that kind of damage, there is evidence of fairly large meteorites hitting the Earth in the past. In 1908 a large area of forest in Tunguska, Siberia was destroyed by a meteorite that came apart just before it hit the ground. The moon, however, has about three billion craters陨石坑caused by meteorites impacting影响 its surface. The reason more meteorites have reached the surface of the moon than the surface of the Earth is that the moon does not have enough atmosphere for the meteorites to burn up in. some of the meteorites that have reached the Earth’s surface have done considerable damage. Some scientists believe it was a change of climate caused by meteorites hitting the Earth that resulted in the extinction of the dinosaurs and other large prehistoric animals.

Scientists are especially interested in meteorites because they contain information about the solar system. It is widely believed by scientists that most meteorites are produced by collisions（碰撞） between asteroids (small planets). These collisions probably happened many billions of years ago. This means the physical and chemical structure of a meteorite can give scientists information about the early days of the universe.

1.The story is about ___.

2.The Earth has ___.

3.Some scientists believe the dinosaurs became extinct because ___.

4.Meteors are ___.

高二英语阅读理解困难题查看答案及解析

We made ____ clear when and where we ____ going to have the meeting.

A．that; are          B．it; are            C．it; were           D．that; were

高二英语单项填空中等难度题查看答案及解析