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题库 / Prep2008E1-CR-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 __________.
many people who watch little or no television do not own a computer
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
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
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
many people use their computers primarily for tasks such as correspondence that can be done more rapidly on the computer, and doing so leaves more leisure time for watching television
情景：电脑的普及让人们越来越缺乏交流了。在美国，凡是拥有电脑的人都比没有电脑的人要少看电视。但是，这个现象并没有表明用电脑导致看电视时间下降。
推理：
找一个可以说明“电脑使用”和“看电视时间减少”没有关系的选项
选项分析：
A选项：许多很少看电视或者不看电视的人都没有电脑。本选项说的是看电视和用电脑之间的关系，不是用电脑和看电视之间的因果联系（注意方向），不能评估整个推理。
B选项：纵然大部分有电脑的人的看电视时间要远低于国家的平均值，但是有些电脑的拥有者看电视的时间远远超过国家平均水平。本选项提及了一部分人的违背推理文段得出的因果关系，所以其能在一定程度上削弱“因”和“果”之间的相关性，可以保留。
C选项：Correct. 美国的电脑拥有者大部分属于很少看电视的人群。本选项给出了“看电视时间短”的另外一个原因，即，不是因为用电脑，而是本身就不爱看电视。
D选项：许多美国的电脑使用者在很多的业余时间放在使用电脑上后，还依然保留有足够的时间来看电视。本选项不涉及用电脑和少看电视间的因果联系。有更多的时间看不等于能多看电视。也不能形成能说明看电视时间减少的独立第三因素，因此可以排除。
E选项：许多人用电脑完成主要的可以用电脑快捷完成的任务比如通信，这么做会留下更多的空闲时间给看电视。本选项和D错误相同。
由于(B)仅仅说明了一部分人的情况，所以解释能力相较于(C)较弱，可以排除。
统计枚举推理: CQ1样本代表性
有电脑的人（ people who own computers）都比没有电脑的人要少看电视。
然而，这一发现几乎没有表明 使用电脑会减少看电视的时间，因为____有电脑的人（computer owners ）大部分∈很少看电视的人群______。
computer owners in the United States predominantly（大多数） belong to demographic groups that have long been known to spend less time watching television than the population as a whole does.
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