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 done more rapidly on the computer, and doing so leaves more leisure time for watching television
一个study：computer owners- watch less tv - than people do not own computers conclusion:that computer use tends to reduce television viewing time 作者观点：conclusion错，原因在于调查结果does very little to show the conclusion也就是“不给力”
A. many people who watch little or no television do not own a computer 【many people who watch little or no television这个人群，没提过，无关】
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 【与national average比，无关】
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 【指出study设计的不严谨性，也就是所选取的样本本身有问题，削弱了conclusion，满足了题目要求】
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 【这个句子里面没有“比较”，只是说了computer owners的某些客观情况，但是，没有跟比较的另一半对象，也就是没有电脑的人进行关联】
E. 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 【=D】作者: sunspirit2011 时间: 2011-9-1 09:53
如此详细的解答，非常感谢！现在弄清楚了！当时做的时候闷掉了，现在想想这是典型的调查类的削弱，正确答案一般就是说明调查样本不具代表性。作者: Nicholas2012 时间: 2011-9-1 16:57
我觉得楼主的标题很令人讨厌。。。作者: cq168088 时间: 2011-9-2 14:27
所以720还要二战是什么心态？非沃顿不去？作者: 单雪丹 时间: 2011-9-26 20:40
我觉得Ｄ 和Ｅ 错得原因是： ＭＡＮＹ 是一个boundary word, many 到底是多少？如果只有５个人是这样呢？ 那也不能解释缘分中的divergency! 而C 刚好填补了这个逻辑漏洞，解释清楚了为什么finding 不能说明此趋势：因为拥有电脑的人本来就很少看电视，所以他们看不看电视，根本不会影响到看电视时间是否会减少这个结果。