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请问OG-80为什么要选E呢?


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.

请问为什么要选E啊,请哪位帮忙解释下好吗?谢谢!

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如果需求的减少是价格下跌的唯一原因,那么价格下跌就不是由供给增加导

致的了( failure to control illegal drugs inflows.带来供给增加)

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如果控制得力, 那么进来的drug就会减少, 相对了, price应该上扬。

但是, 这样的推理的前提是, 假设对drug的需求量不变。

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