prep08,69-122,89题Ron解析

Raepheal.Zuo

many == 代表比率，%

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 predominately belong to a demographic group 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.

On strengthen/weaken/evaluate questions, you should not consider "extremes".
You should always think about the most likely / most reasonable interpretation of every statement in these problems"”whether in the passage itself or in the answer choices.

This is centrally important: you have to ignore/reject farfetched or extreme interpretations. (This is one of the principal reasons why this family of questions is tested more heavily than anything else in CR: "Rules" can't decide whether an interpretation is reasonable.)

Choice A is about the % of survey respondents who watch TV regularly. (Read it again, more carefully.)

This is irrelevant. Regardless of whether people are regular watchers of TV, we can still analyze whether they have reduced the time they spend watching. (Also, even if a relatively small fraction of respondents watch TV regularly, those people's input would still be enough to determine swings in the survey results.)

As stated in the point above, the entire point here is to consider the case BETWEEN these "extremes".

"people who own computers watch, on average, significantly less television than people who do not own computers" is given as a fact.
this is a trend... period. end of story.

choice (a) merely posits the existence of some data that contravene the trend.
but ... so what? some such data can be found for virtually any trend. (for just about any scatterplot, you'll find some "noisy" points that don't follow the line of best fit.)

if the trend is stated as a fact, it's still a fact. i.e., even taking those data into account, the overall trend is still a trend—i.e., the data in choice A are outweighed by the rest of the data.
stated facts are NEVER contradicted in CR problems
analogy:
most men with big feet are also tall. this is a fact—it's a trend that exists in the data.

choice A is like pointing out that ron purewal is only 5'10" (178cm) tall, but wears a US size 16 (euro size 49) shoe.
while in fact true, this statement obviously does not destroy the correlation between height and foot size; it just means that ron purewal is a freak of nature.


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