请教OG10-80

chaosplus

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.

我的问题：
1.这个假设是一个充分的或者必要的假设？如何判断？
2.原文中的结论是什么？论据是什么？
3.E选项的假设是说明在program成功的背景下来自海外的供给并没有减小，只是需求的下降导致了价格的下降？
4.C选项为什么是错误的？

[此贴子已经被作者于2009-6-15 22:23:53编辑过]

chaosplus

贴个洋人的解释，大家看看都有什么想法一起交流！

Let's think about a normal market place.  


        

Supply Side: When do prices go up? When supply is down. When do prices
go down? When there is an oversupply and sellers reduce prices to get
more business.

        

Buy Side: When do prices go up? When demand increases and buyers bid up
the price. When do prices go down? When demand falls and buyers are
less willing to pay a particular price.


        

"If the program had been successful, the wholesale price of most illegal drugs would not have dropped substantially in 1987."

--> This tells us that prices dropped substantially, which tells
us something happened on the buy side or supply side to influence the
price.


        

"The program to control the entry of illegal drugs into the country was a failure in 1987."

--> The author is suggesting that the problem was an oversupply
because unregulated entry would tend to allow lots of drugs to flow
into the country


--> This means the author believes the issue was a supply side problem and not a buy side issue.


        
Choice E states the cause was not entirely due to the buy side,
which is what the author is assuming here (otherwise the entire price
drop could have been due to demand and had nothing to do with supply
nor entry control).