og10-80 帮忙分析一下

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.

The other choices can be false without affecting the argument. The supply of illegal drugs need not have dropped (choice A), and the retail price could have dropped (choice B). The entry of illegal drugs could have risen at a higher rate than domestic production (choice C), and no illegal drug need have undergone a substantial price rise (choice D).

问题是知道e是正确答案，但是为何a-d不正确呢？解释说without affecting the argument，这句话是如何理解呢？项做这种assumption题哪种方法呢？是不是像lawyer说的在作这种题的时候 有时会出现新元素，in demand是不是新元素呢？一连串的问题。谢谢！

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.

The other choices can be false without affecting the argument. The supply of illegal drugs need not have dropped (choice A), and the retail price could have dropped (choice B). The entry of illegal drugs could have risen at a higher rate than domestic production (choice C), and no illegal drug need have undergone a substantial price rise (choice D).

没有贴上，再贴一遍。知道答案e是正确的，为何a-d是不正确的呢？without affecting the argument. 这句话如何理解呢？做这种题型用哪种方法呢？是不是像lawyer说的要出现新元素，in demand是不是 新元素呢？一连串的问题。谢谢