We use our tongue to（）.A、 feelB、 tasteC、 touchD、 see

A.for

B.to

C.toward

D.with

29． When it thunders, we always see the light before we hear the sound．______ It’s because

A． our eyes are in front of our ears

B． our eyes are cleverer than our ears

C． our eyes can see but our ears can-t

D．light goes faster than sound

Why does the author say "we are deprived of the use of our eyes" ?

A． People won't use their eyes.

B． In traveling at high speed, eyes become useless.

C． People can' t see anything on their way of travel.

D． People want to sleep during travelling.

A、whether

B、what

C、which

A fact ;

B fate ;

C faith

A.Seeing

B.Seen

C.To see

D.See

Passage Two

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 nearsighted can only see things that are very close to their eyes. Everything else is not so clear. Many people who do a lot of close work, such as writing, reading and sewing, become near sighted. Then they have to wear glasses in order to see distant (远处的) things clearly'.

People who are nearsighted 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 (角度). To prove this to yourself, look at an object out of one eye; then look at the same object out

of the other eye. You will find the object's relation to the background (背景) 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 distance as people with two eyes.

40. We should take good care of our eyes ______.

A. only when we cannot see perfectly

B. only when we can see well

C. even if we can see well

D. only when we realize how important our eyes are

A.feel

B.taste

C.touch

D.see

A.compacted

B.restricted

C.despersed

D.delated

You are right. How do you analyze our weaknesses?

()we put less emphasis on the overall design.

A、 I’m afraid

B、 I tell you

C、 I see