The growing popularity of computer-based activities was widely expected to result in a decline in television viewing, since it had been assumed that people lack sufficient free time to maintain current television-viewing levels while spending increasing amounts of free time on the computer. That assumption, however, is evidently false: in a recent mail survey concerning media use, a very large majority of respondents who report increasing time spent per week using computers report no charge in time spent watching television. Which of the following would it be most useful to determine in order to evaluate the argument? A. Whether a large majority of the survey respondents reported watching television regularly B. Whether the amount of time spent watching television is declining among people who report that they rarely or never use computers C. Whether the type of television programs a person watches tends to change as the amount of time spent per week using computers increases D. Whether a large majority of the computer owners in the survey reported spending increasing amounts of time per week using computers E. Whether the survey respondents’ reports of time spent using computers included time spent using computers at work

MINE B

ANS E

请指教

调查结论是那些每周使用电脑时间增加的人看电视时间并没有变化，要证明这个结论是否正确，要看他们增加使用电脑时间是工作需要还是占用业余时间玩电脑，如果是前者肯定将削弱调查结果的有效性，因为调查前提是业余时间多少是一定的，你都用来玩电脑了肯定将影响看电视时间，而工作时间使用电脑和看电视是不冲突的。所以应该选E。

B有点偷换概念的意味。那些很少使用电脑的人不能成为有效调查样本，根本说明不了问题。