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不理解 。nn 帮忙啊

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楼主
发表于 2006-5-17 16:06:00 | 只看该作者

不理解 。nn 帮忙啊

A recent survey of all auto accident victims in Dole
County 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 Dole
     County 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 Dole
     County do not involve any serious injury.

怎么  理解?

 A 。 B  看上去一样  阿~ ?
[此贴子已经被作者于2006-5-17 23:43:45编辑过]
沙发
 楼主| 发表于 2006-5-17 23:45:00 | 只看该作者

顶一次啦

板凳
发表于 2006-5-18 02:21:00 | 只看该作者

A concerns people (drivers and passengers) in the survey whereas B concerns all the people (drivers and passengers) in the entire Dole County.

地板
 楼主| 发表于 2006-5-18 11:10:00 | 只看该作者
帮我把这道题 的选项分析一下~ 谢谢   yaoyao99
5#
发表于 2006-5-20 01:04:00 | 只看该作者
See below, explanation from two real nns, =)

[此贴子已经被作者于2006-5-20 7:32:30编辑过]
6#
发表于 2006-5-20 01:13:00 | 只看该作者

这道题目偶看得晕晕的,主要感觉象是数学一样.最后觉得应该选A,这是通过排除法选出来的.后来想了一下,终于有思路了.

B是一个无关选项,本文关心的是发生accidents的时候的受伤情况,而B说的是travelling,并没有和accidents联系起来,而且B是说总体的情况,不是survey的情况,这样就很不能和前面的survey的结果一起来推导出结论.

C.跟rear-seat passengers 的比较是无关比较

D.完全就是前面80% were not wearing的重述,所以不应该选.

E. 一看就是无关,因为根本没有牵涉到accidents reported to the police.

下面解释一下我对A的理解

A说超过20%的人在发生车祸的时候系安全带.

然后再看of the severely injured drivers and front-seat passengers, 80 percent were not wearing seat belts at the time of their accidents,也就是说20%受重伤的人在出车祸的时候系了安全带.

如果系安全带没有作用话,受重伤的人当中也应该是有20%以上的人系了安全带的,但是明显只有20%,也就是说有一部分系了安全带的人没有受重伤,这样就能得到结论.

偶解释得不清楚.......

7#
发表于 2006-5-20 05:58:00 | 只看该作者

我选a

此题说在一次调查中of the severely injured drivers and front-seat passengers, 80 percent were not wearing seat belts at the time of their accidents.意思是严重受伤的人中80%都没有系安全带。然后就直接推出结论说安全带可以减小伤害。其间漏了一环,假如在调查的人群中本来就有20%系了安全带,80%没有系安全带,那么大家事故概率一样的话本来就该是80%的严重受伤者没系安全带,又怎么能说安全带更安全呢?若是更安全,就该是系安全带的虽然占了总人群的20%,而严重受伤的却少于20%。

b说的是那里人平时的习惯,没说是在survey里的人群,无关

c说的前后座,无关

d说的more than half,可以是60%,也可以是90%,要是90%的人遭事故时没系安全带,而却只有80%严重受伤,岂不是说那10%的系安全带的占到20%的严重受伤比例?这是削弱

e明显无关

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