摘要:3.There be结构中.当说话人考虑必须有人去完成某件事时. There is nothing to worry about. 没什么可担心的. There is nothing to fear. 没有什么可害怕的. 比较: There is a lot of work to do. 有许多事情要做. There is a lot of work to be done. 有许多事情要做. She has two letters to type. 她有两封信要打. She has two letters to be typed. 她有两封信要打. I.表示虚拟语气的不定式完成式. I hoped to have met him at the railway station, but he didn't turn up. 我本希望在火车站接到他.但他未露面. We would love to have gone to the match, but the tickets were all sold out. 我们原想去看这场比赛的.但票已售完了. The plane was to have taken off at 9, but something went wrong. 飞机原计划九点起飞.但出现了一些故障. J.用于感叹句. 不定式可用于感叹句.含有惊异.不满.惋惜或赞美等感情色彩. To think that he should do this! 想想.他竟然干出这等事! Oh, God, to see her dance ! 哦.天哪.看看她的舞蹈! To think that all the money has been wasted. 想想.所有的钱都被浪费掉了!

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There are many commonly held beliefs about eyeglasses and eyesight that are not proved facts. For example, some people believe that wearing glasses too soon weaken the eyes. But there is nothing to show that the structure (结构) of eyes is changed by wearing galsses at a young age. Wearing the wrong galsses, however, can prove harmful. Studies show that only children can develop loss of sihgt if they have the wrong glasses. We have all heard some of the common myths(荒诞的说法)about how eyesight get bad. Too little light makes the eyes work harder, so they do get tired and strained (过劳). Eyestrain also resulsts from reading a lot, reading in bed, and watching too much television. But, although eyestrain may cause some pain or headaches, it does not harm eyesight all the time. Another myth about eyes is that they can be replaced from one person to another . It is quite difficult to connect aneyeball to a new brain.And it is impossible to replace a whole eyeball to a new person. Only certain parts of the eye can be replaced now. But if we keep clearing up the myths and learning more about the eyes, some day it may be possible to replace a full eyeball.

1.

One cause of eyestrain mentioned in the passage is ____.        .

A.wearing eyeglasses too long

B.going to the cinemas

C.reading a lot

D.not visiting your eye doctor

2.

.From this passage one can conclude that    ____.   .

A.doctors are still learning things about eyesight

B.headcaches are usually caused by eyestain

C.people should wear glasses as soon as possible

D.people only believe things that are proved facts

3.

"Commonly held beliefs" are ____.       .

A.ideas that only low class people believe

B.ideas that moet people believe

C.beliefs that have something in common

D.foolish beliefs

4.

This passage mainly tells us that ____.

A.people have many wrong beliefs about eyes and sight.

B.there are many things about the body that are not completely understood

C.there are several cuases of eyestrain

D.eyes are very important to people

 

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