题目内容
（请给出正确答案）
A.2341
B.1234
C.3214
D.4321
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更多“How do we tighten sentences？(排…”相关的问题
We often use signs as well as words to tell people _________.
A.what to do
B.to do how
C.how to do
D.to do what
A.How many PE classes do we have
B.o you like PE classes
C.When do we have PE classes
—Do you think we’ll still catch the train？ — Well, we won’t we walk faster.
A.as
B.unless
C.until
D.no matter how
A.formal words
B.common words
C.colloquial words
D.slangs
—We have sent out leaflets to all residents, explaining what to do in an emergency.
A.How do you deal with emergency？
B.What have you talked to the public？
C.What do you want the residents do？
A：Do you feel like doing anything this weekend，Jerry？
B：
A. No，I don’t mind doing anything.
B. Yes，all right. What do you suggest？
C. We could always go to Dave’s party.
D. How do you like science fiction movies？
When we see well, we do not think about our eyes very often. (79) 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 seems blurry (模糊的). Many people who do a lot of close work, such as writing, reading and sewing, become nearsighted. Then they have to wear glasses in order to see distant objects clearly.
People who are farsighted 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 olden 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 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 distance as people with two eyes.
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 dell
D．only when 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 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 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 (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.
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
Which of the following statements would proponents of the "nurture "theory agree with？
A．Environment has little to do with behavior.
B．Behaviorist theory is not correct.
C．Biologically based instincts are important in how we act.
D．A person's character is greatly influenced by his environment.
