prep，削弱题到底是否可以反对前提~求帮助！好混乱啊啊~

lyx6117

虽然这道题已经有很多人讨论，但是还是没有明白：The recent decline in the value of thedollar was triggered by a prediction of slower economic growth in the comingyear.  But that prediction would not haveadversely affected the dollar had it not been for the government's huge budgetdeficit, which must therefore be decreased to prevent future currency declines.


Whichof the following, if true, would most seriously weaken the conclusion about howto 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 recentprediction of slower economic growth.
(D)Before there was a large budget deficit, predictions of slower economic growthfrequently caused declines in the dollar's value.
(E)When there is a large budget deficit, other events in addition to predictionsof slower economic growth sometimes trigger declines in currency value.


我的理解是：deficit 导致prediction，从而导致dollar decline.
但是正确选项D中，直接否了论据，说没有deficit的时候，prediction就导致下降。那岂不是说deficit不能导致preciction？
因为之前见过了削弱题都是削弱逻辑链，没有直接否定论据的，所以觉得很奇怪。


之前看讨论帖，有人说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.整个这一句都是结论而非论据。那这样说，岂不是只有prediction导致deficit是论据？那这是怎么推倒的...


好混乱啊~求指条明路~

lyx6117

Premise:
1) The devaluation of the dollar was triggered by a prediction of slower economic growth
2) If there is no government's huge budget deficit,  the prediction alone will not affect the dollar devaluation.

Conclusion: government's huge budget deficit must be decreased to prevent future currency declines

Answer (D) Before there was a large budget deficit, predictions of slower economic growth frequently caused declines in the dollar's value.

If D is true, then premise 2 is wrong since apparently the prediction alone can cause the devaluation.  So D weakens the argument and D is the anwer

-- by 会员 sdcar2010 (2012/4/7 13:38:16)

但是逻辑题怎么可以直接说论据本身是错误的呢？
如果论据是错误的那所有的逻辑题岂不是都可以说因为premise是错的所以直接削弱= =
而且之前也没有见过直接削弱论据的例子呐

sdcar2010

Premise:
1) The devaluation of the dollar was triggered by a prediction of slower economic growth
2) If there is no government's huge budget deficit,  the prediction alone will not affect the dollar devaluation.

Conclusion: government's huge budget deficit must be decreased to prevent future currency declines

Answer (D) Before there was a large budget deficit, predictions of slower economic growth frequently caused declines in the dollar's value.

If D is true, then premise 2 is wrong since apparently the prediction alone can cause the devaluation.  So D weakens the argument and D is the anwer

lyx6117

求nn解释T T