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发表于 2016-9-30 20:24:54
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Nowadays more and more people have to spendlengthy hours before computers. Computers arealmost indispensable to modern life. No one canimagine the results if the computer he uses dailywould break down. [26]But computers also causesome problems. Among them is the potential harmto human bodies, especially to eyes.
Working long hours at a computer can cause eyestrain. Recently a letter to the New EnglandJournal of Medicine provides one explanation for the problem. Japanese researchers studiedsome 50 office workers who spent an average of three hours a day at a terminal. [27]Sinceblinking keeps eyes moist-thus reducing strain-the researchers counted blinking rates underdifferent conditions. The workers averaged 22 blinks a minute when relaxed, ten blinks aminute while reading a book and just seven a minute while reading text on a computer screen.Thus people keep the least moisture in their eyes when they are working at a computer and feelmore strained. Furthermore, the computer workers also kept their eyes open wider, whichmeant moisture evaporated more quickly.
[28]If you work at a computer screen, close your eyes periodically. That spreads a tear filmand rests your eyes. And remember to blink more often. In this way you can reduce the sideeffect caused by using computer to a greater extent.
答案解析：
26. What is the result of using computer in our daily life?
[A]解析：细节题。computer是人们日常生活、工作不可缺少的一部分，但短文同时指出，电脑也带来问题，其中一个就是可能给人的身体带来伤害。故A正确。BUT题，听到BUT就知道其后的内容需要格外重视。
27. What is the cause of eyestrain?
[D]解析：推断题。短文提到：“...blinking keeps eyes moist-thus reducing strain...”（眨眼使眼睛保持湿润，从而减少眼疲劳）；而短文还指出，使用电脑时人们的眨眼频率仅为每分钟7次，非常低，因此眼睛的湿润度很低，由此引起眼疲劳。故D正确。
28. What are those who spend long hours before computers supposed to do?
[C]解析：细节题。短文提到，如果你工作中面对电脑，应该经常性地闭眼休息。因此C正确。
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