大全-2-14求教高手

14.   A recent survey of all auto accident victims in laceName w:st="on">DolelaceName> laceType w:st="on">CountylaceType> found that, of the severely injured drivers and front-seat passengers, 80 percent were not wearing seat belts at the time of their accidents. This indicates that, by wearing seat belts, drivers and front-seat passengers can greatly reduce their risk of being severely injured if they are in an auto accident.

The conclusion above is not properly drawn unless which of the following is true?

(A) Of all the drivers and front-seat passengers in the survey, more than 20 percent were wearing seat belts at the time of their accidents.

(B) Considerably more than 20 percent of drivers and front-seat passengers in laceName w:st="on">DolelaceName> laceType w:st="on">CountylaceType> always wear seat belts when traveling by car.

(C) More drivers and front-seat passengers in the survey than rear-seat passengers were very severely injured.

(D) More than half of the drivers and front-seat passengers in the survey were not wearing seat belts at the time of their accidents.（A）

(E) Most of the auto accidents reported to police in laceName w:st="on">DolelaceName> County do not involve any serious injury.

请问这道题考的是什么? 做题的时候我总不能做杂那里算吧

原因是：事故中严重受伤的前排乘客和司机中，80％不带安全带

结论是：带安全带可以降低受伤的几率。

找到支持的选项就可以

A说带安全带受伤的比例小。这就是支持了。

版主, 你把选项再读一遍, 说的好象不是那个意思

Please refer to the following link:

http://forum.chasedream.com/dispbbs.asp?BoardID=24&ID=2264

Cranberry has a much more elaborate explanation there.

Enjoy!

我理解这是assumption的题目。A是为了说明survey 的driver有代表性。

Test18-IV-19可能有主语理解本题。

19.   In a recent advertisement, a major cereal company contended that the better educated people are, the more likely it is that as children they regularly ate oatmeal. As evidence, the company cited a national random survey of college graduates in which four-fifths of all those surveyed reported having eaten oatmeal at least once a week when they were young.

Which one of the following is an additional piece of information that would support the cereal company’s conclusion?

(A) Four-fifths of all current college graduates eat oatmeal regularly.

(B) Fewer than four-fifths of those without a college degree ate oatmeal regularly when they were children.

(C) Among people who have additional education beyond college, four-fifths ate oatmeal regularly when they were children.

(D) More than four-fifths of the population at large—college graduates and nongraduates combined—ate oatmeal regularly when they were children.（B）

(E) Those college graduates who did not eat oatmeal regularly when they were children did eat oatmeal on an occasional basis.

以下引用某兄弟的解释（抱歉没有找到原链接）：

B, 可以简单理解为上大学的有4/5吃过这种麦片，把without a college degree理解为没考上大学的。尽管调查是在college graduates中进行的，但这是额外的信息，并不一定是在调查中得到的信息。这题的逻辑可以用数学方法表达。

例如100人中，有50人考上大学，这50人中有40人吃麦片，考上大学的比率为50/100=1/2；

如果没考上大学的50人中吃麦片的人比例不低于4/5，假设为45人，那么吃麦片的人考上大学的比率为40/(40+45)，小于一般的上大学的比率1/2，说明吃麦片根本没用；

如果没考上大学的50人中吃麦片的人比例低于4/5，假设为35人，那么吃麦片的人考上大学的比率为40/(40+35)，大于一般的上大学的比率1/2，说明吃麦片有用，因此这是支持。

怎么不是呢，呵呵，20％多的人带安全带，受伤的只占20％，不是说明带安全带的人受伤几率小么