[CR. ] pp08 cr2-89
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
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
答案是C，但為什麼A不對呢？
是不是因為 "many people"不足以解釋整體 on average 的影響？
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