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标题: 哪个是充分哪个是必要条件?OG81 [打印本页]

作者: Freehorser    时间: 2007-10-16 13:27     标题: 哪个是充分哪个是必要条件?OG81

OG81.

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 would be most seriously weakened if it were true that

(A) in 1987 smugglers of illegal drugs, as a group, had significantly more funds at their disposal than did the country’s customs agents

(B) domestic production of illegal drugs increased substantially in 1987

(C) the author’s statements were made in order to embarrass the officials responsible for the drug-control program

(D) in 1987 illegal drugs entered the country by a different set of routes than they did in 1986 B

(E) the country’s citizens spent substantially more money on illegal drugs in 1987 than they did in 1986.

答案B倒是不难选出.可是看了OG解释有点胡涂了

按照题目, 项目成功(即走私非法药减少)-->价格不会降低, 此逆否命题为: 价格降低-->项目失败(即走私非法药增多)

但根据答案,好象推理应该是相反:走私非法区增多-->价格降低. B表明了有其它原因导致价格降低

哪们NN帮我理理头绪


作者: SunnyApples    时间: 2007-10-16 20:12

是C-->B否。 肯定是他因引起的结果不同。

前面讲了药价降低的主要原因是走私药,推理是走私药的禁止--〉药价的上升。那么一件事导致另一件事情,就肯定有他因可以削弱。

如果光顾着看解释我觉得也可能看晕掉


作者: Freehorser    时间: 2007-10-17 13:09

真不好意思,我还是不太懂,能不能再帮我解释你的那句"那么一件事导致另一件事情,

就肯定有他因可以削弱。"的意思

谢谢.


作者: veronica845    时间: 2007-10-17 19:53

项目失败。因为如果项目成功,药价格不会下降。

削弱:

原文意思是。项目失败,没控制走私药,药价格下降。

削弱的话:他原因引起——本地供给增加,药价格下降。


作者: pocahontas    时间: 2007-10-18 13:14

说得简单点,削弱就是即使走私控制了,药价还是会下降

当然也是就他因啦






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