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 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 are very close to their eyes. Many people who do a lot of close work, such as writing, reading and sewing, become nearsighted. They have to wear glasses in order to see distant things clearly. 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.
16: When can people think about our eyes very often?
17: What things can nearsighted people see clearly?
18: Who will become nearsighted easily?
19: Why do nearsighted people wear glasses?
20: What problem do farsighted people suffer from?
选项
答案close work
解析 根据提示信息可知所缺内容是有关容易造成近视原因的，而文中有原话“Many people ho do a lot of close work，such as writing，reading and sewing，become nearsighted．”(那些从事如写作、阅读和缝纫等近距离工作的人很容易近视。)故此处应填“close to”。
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