有点糊涂！请帮我理一下，答案d

斯巴达

45.    (33087-!-item-!-188;#058&007558)  逻辑意思  搞不明白

The recent decline in the value of the dollar was triggered by a prediction of slower economic growth in the coming year.  But that prediction would not have adversely affected the dollar had it not been for the government's huge budget deficit, which must therefore be decreased to prevent future currency declines.

Which of the following, if true, would most seriously weaken the conclusion about how to prevent future currency declines?

(A) The government has made little attempt to reduce the budget deficit.
(B) The budget deficit has not caused a slowdown in economic growth.
(C) The value of the dollar declined several times in the year prior to the recent prediction of slower economic growth.
(D) Before there was a large budget deficit, predictions of slower economic growth frequently caused declines in the dollar's value.  （以前也经常发生过）
(E) When there is a large budget deficit, other events in addition to predictions of slower economic growth sometimes trigger declines in currency value.

zhanghuijie

先解释下题目意思。1 经济下降的预测导致美元贬值；2 但如果这种预测的做出不是由于财政赤字，那么就不会造成贬值（换句话说就是只有财政赤字预测才会造成贬值）；3 因此我们要减少财政赤字。
题目的推理过程实际少了一步 2之后省略了一句话——4 那么现在的贬值一定是由于政府赤字的预测造成的（由1+2可推出），之后再说3，就通顺多了。
总的逻辑关系是1+2推出3, 3推出4
选D的原因是它反驳了2，即论据之一。
因为Before there was a large budget deficit, predictions of slower economic growth frequently caused declines in the dollar's value. 所以除赤字之外的其他原因也可能造成贬值。与2相矛盾。
这道题反对的方法既可以说是 反对前提，即A推出B，如说A不成立，则削弱成立
也可以说是拆桥法，即拆除假设2使推理不成立。

sunluning0

觉得这题出得不好，答案刚好是反对了But that prediction would not have adversely affected the dollar had it not been for the government's huge budget deficit。这句话本身。不是说weaken的题型里，要认为题干部分叙述为真的吗？

zhanghuijie

觉得这题出得不好，答案刚好是反对了But that prediction would not have adversely affected the dollar had it not been for the government's huge budget deficit。这句话本身。不是说weaken的题型里，要认为题干部分叙述为真的吗？

-- by 会员 sunluning0 (2010/5/17 15:06:51)

就是说以题干为真才可以削弱它啊，如果题干为假就不需要削弱了……
个人意见，仅供参考……