He is not as ___ as his younger brother.  

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. 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 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. tailor??? B. doctor??? C. guard??? D. painter

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

完成句子,使改写后的句子完整,并与原句意思相符,注意每空只填一个单词。

1.Chinese is not as important as English.

Chinese is _____________ important _____________English.

2.You should look after the young tress well.

You should ___________ ___________ ___________ ___________ the young trees.

3.There are not many apples in the box.

There are ___________ ___________ apples in the box.

4.Can you call me when you come back?

Can you call me when you ___________ ___________?

5.I can’t hear anything because it’s too noisy.

I can hear ______________ because there is _____________ noise.

Do animals have a culture? What do we mean by “culture”? Recently social scientists have begun to ask if culture is found just in humans, or if some animals have a culture, too. When we speak of culture, we mean a way of life that a group of people have in common. Culture is the forms of behavior (行为) that help people to live together. It is also the forms of behavior that make one group of people different from another group.

Human beings use tools, cooperate(合作) with one another, and communicate with language. But these aspects(方面)of human behavior, or “culture”, can also be found in the lives of certain animals. Animals can make tools , for example. We used to think that the ability to use tools was the dividing line between human beings and other animals. Lately, however, we have found that this is not the case. Chimpanzees(黑猩猩) can not only use tools but actually make tools themselves. So it may be important for us to know that the line dividing us from animals is not as clear as we used to think.

1.According to the article, “culture” means_____.

A. the languages we learn

B. the good habits we share with each other

C. the forms of behavior we have in common

2.The traditional idea about dividing animal from human beings is that ______.

A. human beings can use tools

B. Human beings can depend on each other

C. human beings have the language to communicate

3.From the chimpanzees can use and make tools, we know____.

A. animal may have a culture like our own

B. animals can be as clever as human beings

C. animals have the ability to help human beings