一道tn题答案是不是有问题...

gmatziyu

T-4-Q28

In Berinia, the age at which people could begin to drink alcohol legally used to be 18. In 1990, in an attempt to reduce alcohol consumption and thereby to reduce alcohol-related traffic deaths among Berinians under 21, the legal drinking age was raised to 21. Alcohol-related traffic deaths among people under 21 have decreased significantly since 1990. Nevertheless, surveys show that people in that age-group drink just as much alcohol as they did before 1990.

Which of the following, if true of Berinia, most help to resolve the apparent discrepancy?

A.For the population as a whole, annual alcohol consumption is no lower now than it was in 1990

B.Alcohol consumption away from home, for example in bars and restaurants, is much lower among people under 21 than it was in 1990

C.The proportion of people under 21 who own a car is higher now than it was in 1990

D.Alcohol consumption is lower among people under 21 than among adults in most other age-groups.

E.Alcohol-related traffic deaths among people over 21 have increased slightly since 1990.

答案：b
可是我觉得c是正确的，traffic death减少的原因是21岁以下的人驾车人数增加了，分母增加了，所以比率减少了。。
b感觉是不相关的阿。。。
求教中。。。。谢谢

Lonelydance

答案就是b,问题是要解决一个矛盾:虽然特定年龄组的饮酒量并没下降,但是车祸发生两在这个年龄组却下降了许多.
   c 说的是年龄低于21岁的人现在占有车辆的比例比以前少了.  原文探讨的是发生车祸在某个年龄组的比例变化,这个选项是占有车的人在某个年龄组得比例,完全是两个问题,是无关选项
  b 说的是酒精消耗量在某个年龄组的比例,由于提干说了酒精消耗可以导致车祸,其实这个选项就等价于 车祸发生在某个年龄组的比例,和提干探讨的问题是一致的,所以比c更切题.而for example in bars and restaurants,这个市可以无视的,它是迷惑信息,就是为了让您觉得他是无关选项

hughlv

T-4-Q28

In Berinia, the age at which people could begin to drink alcohol legally used to be 18. In 1990, in an attempt to reduce alcohol consumption and thereby to reduce alcohol-related traffic deaths among Berinians under 21, the legal drinking age was raised to 21. Alcohol-related traffic deaths among people under 21 have decreased significantly since 1990. Nevertheless, surveys show that people in that age-group drink just as much alcohol as they did before 1990.

Which of the following, if true of Berinia, most help to resolve the apparent discrepancy?

A.For the population as a whole, annual alcohol consumption is no lower now than it was in 1990

B.Alcohol consumption away from home, for example in bars and restaurants, is much lower among people under 21 than it was in 1990

C.The proportion of people under 21 who own a car is higher now than it was in 1990

D.Alcohol consumption is lower among people under 21 than among adults in most other age-groups.

E.Alcohol-related traffic deaths among people over 21 have increased slightly since 1990.

答案：b
可是我觉得c是正确的，traffic death减少的原因是21岁以下的人驾车人数增加了，分母增加了，所以比率减少了。。
b感觉是不相关的阿。。。
求教中。。。。谢谢

-- by 会员 gmatziyu (2010/4/6 16:43:05)

lz对c选项的理解感觉不太准确，Alcohol-related traffic deaths among people under 21这个句子提到的分母并不是驾车的人数，而是21岁以下的总人数。如果c成立的话，应该会导致deaths相应增加而不是减少。所以c选项无法解决这个discrepancy。

要理解为什么b是正确选项，需要加一点推导。如果喝酒需要离开家到别的地方去比如酒吧，那么通常需要使用交通工具。因为自1990以后更多的人选择在家里喝，所以自然导致醉酒驾车的死亡率降低，所以可以成功解决discrepancy。

gmatziyu

hughlv 和lonely dance..
解释得很明白了。。。。

dajiahaoh

C肯定不对，有没有车和车祸发生无关。酒后驾车可以制造车祸，而酒后没车也可以被撞死，导致车祸。题目没告诉你就不要自己揣测，硬把交通事故和驾车联系在一起。你没车，喝醉了走到大街上，也可以因为各种原因导致Alcohol-related traffic deaths。所以c是标准的无关选项。

B是相对比较有关的，虽然第一眼一看觉得不是答案。但重新比较一遍答案时，B还是相关的