The program to control the entry of illegal drugs into the country was a failure in 1987. If the program had been successful, the wholesale price of most illegal drugs would not have dropped substantially in 1987.

80. The argument in the passage depends on which of the following assumptions?

(A) The supply of illegal drugs dropped substantially in 1987.

(B) The price paid for most illegal drugs by the average consumer did not drop substantially in 1987.

(C) Domestic production of illegal drugs increased at a higher rate than did the entry of such drugs into the country.

(D) The wholesale price of a few illegal drugs increased substantially in 1987.

(E) A drop in demand for most illegal drugs in 1987 was not the sole cause of the drop in their wholesale price.

请问大牛：为什么A, B, C, D选项为什么不对。OG给出的解释是说，对他们取非之后，原文结论仍然成立。 我怎么也想不明白对他们取非之后和原文有什么关系？这样子，我可能存在两个误区：

1。对原文的结论理解有误。（我对原文逻辑是：price decreased-->program failure）.

2。对选项取非的方法有错误。这个我很弱。我取非如下：

A: The supply of illega drugs didn't drop substantially in 1987.

B. The price paid for most illegal drugs by the average consumer did drop substantially in 1987.

C.Domestic production of illegal drugs did not increased at a higher rate than did the entry of such drugs into the country.

D. The wholesale price of few illegal drugs increased substantially in 1987.

我这样子取非有问题吗？如果不对，应该如何取非呢？

如果取非正确，那么他们取非后对原结论有什么影响啊？我实在看不出来。

这道题目，首先要注意其具体性和特殊性。本题讲的是entry和price之间的关

系。所以我们第一步就可以排除B和C，因为customer和rate跟本题完全没有关

系。第二步我们来剩下的ADE，A，supply下降了，这跟原文的entry下降是一个

概念，那么A说的是一种结果而不是一个假设，而且这个结果还跟文章的结论是

相反的。所以A肯定不对（假设题不可以反对文章给出的前提和结论，文章的结

论就是program失败了，既然失败那么entry就没有drop，A正好相反）。同理，

D只是用肯定的语气重复了一下原文给出的条件，这也不是假设，而是原文信息

的重复，所以D也不是答案。

E排除了一个他因，所以是答案。

你的取非前三个都没有问题，D的取非应该是didn't increase。