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求助！！新prep2-89
Which of the following most logically completes the argument?
The growing popularity of computer-based activities was widely predicted to result in a corresponding decline in television viewing.Recent studies have found that, in the United States, people who own computers watch, on average, significantly less television than people who do not own computers.In itself, however, this finding does very little to show that computer use tends to reduce television viewing time, since __.
A. many people who watch little or no television do not own a computer
B. even though most computer owners in the United States watch significantly less television than the national average, some computer owners watch far more television than the national average
C. computer owners in the United States predominantly belong to demographic groups that have long been known to spend less time watching television than the population as a whole does
D. many computer owners in the United States have enough leisure time that spending significant amounts of time on the computer still leaves ample time for watching television
E. many people use their computers primarily for tasks such as correspondence that can be television
正确答案选C,但我对B和D都有点疑惑。。
我是这么理解的，请牛人们指点。。
题目：随着电脑的普及，看电视越来越少了。但调查显示，平均来看,有电脑的人比没电脑的人看电视更少了。但是，这并不能说明电脑的使用会减少看电视的时间，因为------
B 有些有电脑的人看电视的时间比国内平均看电视时间长，有的人看电视的时间比国内平均看电视时间短，我觉得这么选项很模糊，并不能说明调查结果是有效还是无效。
C说原文中的现象是地域性的，所以不能反映整体水平，这我可以理解。。
D很多拥有电脑的人，有很多的业余时间，他们在使用电脑花了很多时间后，仍有大量时间用来看电视。 |
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