2. 自考
  3. Problems Caused by Using Computers Long hours at the screen can cause【C1】______ (ache) eyes,【C2】______ (blur) vision and hea

Problems Caused by Using Computers Long hours at the screen can cause【C1】______ (ache) eyes,【C2】______ (blur) vision and hea

admin2018-05-07  7
问题     Problems Caused by Using Computers
    Long hours at the screen can cause【C1】______ (ache) eyes,【C2】______ (blur) vision and headaches, experts say. In fact, eyestrain surpasses even wrist pain as the top physical【C3】______ (complain) among heavy computer users. When peering into the computer screen, the eye’ s focusing muscle is at constant tension.
    Like any muscle, it feels sore when【C4】______ (overload). And when someone spends a lot of time looking at something close, the eye muscle can get【C5】______ (stick) on the near-focus setting and have difficulty relaxing, leaving the person【C6】______ (temporary) nearsighted, a condition called accommodative spasm (痉挛) that can last seconds or hours. The letters on the screen are not as clearly【C7】______ (define) as on a printed page. Take a magnifying glass to your monitor and you’ll see the letters, each made up of pinpoint sources of light, have no sharp edges. But those liquid crystal display (LCD) monitors, like those found on laptop computers, are【C8】______ (easy) on the eyes because they display sharper images. And studies have shown that when people are working on a computer, their rate of【C9】______ (blink) goes down by two-thirds, which can result in dry, stinging eyes. This is especially a problem for contact-lenses【C10】______ (wear).
【C4】
选项
答案overloaded
解析 观察本句不难发现本句的时间状语从句省略了成分，补充完整时应是“Like any muscle，it feels sore when it is______”，it在句中指代muscle，名词muscle和提示词动词overload(超载；超负荷)属被动关系，因此，此状语从句中应使用被动语态，即it feels sore when it is overloaded。原文正是省略了it is，因此，将动词overload成过去分词overloaded填入空白处，符合语法和语境要求。
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