80.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.

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

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

80.

The only choice that must be true in order to conclude legitimately from the drop in the wholesale price of illegal drugs that the program was a failure is choice E, the best answer. If the drop in price was caused by a drop in demand, there is no reason to suspect that there has been any increase in supply caused by drugs entering the country.

我理解og的讲解是

取非，如果需求是主要原因，那么国外药物可否进入就不是影响国内价格降低的最根本原因

可是需求就应该是主要原因，那么非法药物的进入才会影响到国内药物的价格阿，非法药物的进入影响国内药物价格不就是因为供给的不同，需求会产生变化的原因么，所以间接还是和需求有关阿

这题我到现在已经晕菜了，哪位高人点拨以下，谢拉