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  3. Some say it is evident that computers can damage a person’s eyesight. Since the popularity of computers began to skyrocket, ther

Some say it is evident that computers can damage a person’s eyesight. Since the popularity of computers began to skyrocket, ther

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问题     Some say it is evident that computers can damage a person’s eyesight. Since the popularity of computers began to skyrocket, there have been questions【C1】______with computer screens and eye strain. There are plenty of symptoms that often show up as a result of eye strain from computer screens. It may first start with a little【C2】______Then, it may progress to dry eyes,【C3】______vision and even headaches. However, the extent to which computer screens damage eyesight is【C4】______unclear.
    Taking a ten to 15 minutes’ break every hour while working is a good way to help avoid this and rest your eyes, though your【C5】______may not be as generous with your break periods. If possible, break up computer tasks and non-computer tasks throughout the day as much as possible.
    One of the major improvements in computer screens has also helped. Still, even an LCD screen, if it is not adjusted【C6】______or if it is too bright, can be just as hard on the eyes. This is very important as many people tend to keep their LCD screens too bright, simply because they are not viewing them from a proper angle and may be trying to【C7】______for the "screen door" effect.
    Fortunately, most of the eye damage, if it is to be called that, resulting from the use of computer screens tends to be a【C8】______situation. Once the eyes are rested long enough, the symptoms tend to quickly go away. However, if the eyes are not【C9】______rested, the symptoms may return quicker than they appeared at first once computer activities【C10】______
    A)somewhat B)principal C)temporary D)vulnerable
    E)soreness F)properly G)sufficiently H)whereby
    I)compensate J)employers K)associated L)prospect
    M)blurred N)proceeded O)resume
【C6】
选项
答案F
解析 空格所在句子的主句内容是“液晶屏也可能对眼睛造成伤害”，if从句用以说明液晶屏会伤害眼睛的条件，该从句主谓结构完整，由此可见应填入副词，properly代入文中意为“如果液晶屏调试不得当”，符合句意。
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