请教大全-11-11

dreamerps

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.

请问为什么选C啊？怎么就支持了结论了呢？

dreamerps

顶~~~~~~~~~``

ayang1017

以下是引用dreamerps在2005-9-21 17:44:00的发言：

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.

请问为什么选C啊？怎么就支持了结论了呢？

这道题得支持是如何让两个划线部分划上等号，以形成支持，c得划线部分很好得完成了这点

含草舵手

过去三年中，高年级使用非法药品的人数下降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?
以下哪项如果正确将会支持调查结果——用非法药品的20岁以下的人数下降？

(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.
在20岁以下的人中，高年级学生用药水平的变化与其他学生用药水平的变化相符。


(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.
在过去，高年级学生用非法药品的人数最多


(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.
高年级学生用非法药的比例与20岁以下的人持续用非法药的比例相似


(D) The decline revealed by the surveys is the result of drug education programs specifically targeted at those below the age of 20
题目中所描述的下降是药物教育的结果


(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.
承认卖过非法药品的人的数量下降更快。

从高年级使用非法药品的人数下降推出20岁以下使用非法药品的人数，必然是这两个人群之间有相似性。故答案为C。