大全-11-11

tianwan

An annually conducted, nationwide survey shows a continuing marked decline in the use of illegal drugs by high school seniors over the last three years.

11.   Which of the following, if true, would provide most support for concluding from the survey results described above that the use of illegal drugs by people below the age of 20 is declining?

(A) Changes in the level of drug use by high school seniors are seldom matched by changes in the level of drug use by other people below the age of 20.

(B) In the past, high school seniors were consistently the population group most likely to use illegal drugs and most likely to use them heavily.

(C) The percentage of high school seniors who use illegal drugs is consistently very similar to the percentage of all people below the age of 20 who use illegal drugs.

(D) The decline revealed by the surveys is the result of drug education programs specifically targeted at those below the age of 20.（C）

(E) The number of those surveyed who admit to having sold illegal drugs has declined even faster than has the number who have used drugs.

怎么排除B？

mariezhu

survey里说high school senior中吸毒的人大大减少。

问题问如何支持这一结论：20岁以下的吸毒人员减少。

那么答案就应该将senior和20岁以下的人联系起来。而B仅仅表示在过去这些senior是最容易吸毒，而且吸毒最多的人。没有支持问题中提到的结论

LES

还有一点，我觉得这题的关键是样本是否具有代表性问题。如果high school senior 本身不具有20岁一下青少年的代表性的话，那么这个小样本的特征也不具代表性。具体的讲：如果 high school senior 占据20岁以下很小部分的话，那么即使他们全体都吸毒也只是人群中很小的一部分。

tianwan

谢谢2位MM，俺懂了。

小女公子

那么请问怎样排除D呢？

我觉得，样本说的是高三学生吸毒下降是一个programme的结果。

这个programme主要针对的是20岁以下的年轻人。那么就可以推出在teenager中的效果自然就更好啦…………

小女公子

up

channing76

偶的看法是：提问强调below the age of 20 这个核心词，是答案不可少的；问加强the use of illegal drugs below the age of 20 is declining；

B，In the past和原文有出入，为无关项。而且为削弱项；

D，result of drug education programs 能否真的产生效果哪？按GWD的说法是不客观。无关

wwwhahchn

我也觉得是D

请问C怎么翻译？？到底是哪两个百分比相似？？

julia_ju

以下是引用wwwhahchn在2005-5-16 15:13:00的发言：

我也觉得是D

请问C怎么翻译？？到底是哪两个百分比相似？？

高三吸毒学生/高三学生

＝

20以下吸毒人数/20以下的人数

wwwhahchn

C为什么对？

consistently是不是说两者的变化是同步的？？