Passage One
Nowadays more and more people have to spend lengthy hours before computers. Computers are almost indispensable to modern life. No one can imagine the results if the computer he uses daily would break down. [26]But computers also cause some problems. Among them is the potential harm to human bodies, especially to eyes.
Working long hours at a computer can cause eyestrain. Recently a letter to the New England Journal of Medicine provides one explanation for the problem. Japanese researchers studied some 50 office workers who spent an average of three hours a day at a terminal. [27]Since blinking keeps eyes moist-thus reducing strain-the researchers counted blinking rates under different conditions. The workers averaged 22 blinks a minute when relaxed, ten blinks a minute 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 feel more strained. Furthermore, the computer workers also kept their eyes open wider, which meant moisture evaporated more quickly.
[28]If you work at a computer screen, close your eyes periodically. That spreads a tear film and rests your eyes. And remember to blink more often. In this way you can reduce the side effect 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：細(xì)節(jié)題。computer是人們?nèi)粘Ｉ睢⒐ぷ鞑豢扇鄙俚囊徊糠郑涛耐瑫r(shí)指出，電腦也帶來(lái)問(wèn)題，其中一個(gè)就是可能給人的身體帶來(lái)傷害。故A正確。BUT題，聽(tīng)到BUT就知道其后的內(nèi)容需要格外重視。
27. What is the cause of eyestrain?
[D]解析：推斷題。短文提到：“...blinking keeps eyes moist-thus reducing strain...”（眨眼使眼睛保持濕潤(rùn)，從而減少眼疲勞）；而短文還指出，使用電腦時(shí)人們的眨眼頻率僅為每分鐘7次，非常低，因此眼睛的濕潤(rùn)度很低，由此引起眼疲勞。故D正確。
28. What are those who spend long hours before computers supposed to do?
[C]解析：細(xì)節(jié)題。短文提到，如果你工作中面對(duì)電腦，應(yīng)該經(jīng)常性地閉眼休息。因此C正確。