2. 外语
  3. When can people think about our eyes very often? On the time when we______.

When can people think about our eyes very often? On the time when we______.

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问题 When can people think about our eyes very often?
On the time when we______.  
When we can see well, we do not think about our eyes very often. It is(Q11)only when we cannot see perfectly that we come to see how important our eyes are. People who are nearsighted can only see things that (Q12) are very close to their eyes. Many people who do a lot of close work, (13)such as writing, reading and sewing,  become nearsighted. They have to wear glasses (Q14)in order to see distant things clearly. (Q15)People who are farsighted suffer from 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.
Q11: When can people think about our eyes very often?
选项
答案can’t see well/perfectly
解析 该题为简答填空题。根据短文的第一句“it is only when we cannot see perfectly that we come to see how important our eyes are.”(只有当我们视力下降的时候才会体会到眼睛的重要。)可以知道，只要换一种说法就是答案了，故此处应填“can’t see well/perfectly”。
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