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题库 / Prep2007E1-CR-56
Crops can be traded on the futures market before they are harvested. If a poor corn harvest is predicted, prices of corn futures rise; if a bountiful corn harvest is predicted, prices of corn futures fall. This morning meteorologists are predicting much-needed rain for the corn-growing region starting tomorrow. Therefore, since adequate moisture is essential for the current crop's survival, prices of corn futures will fall sharply today.
Which of the following, if true, most weakens the argument above?
Corn that does not receive adequate moisture during its critical pollination stage will not produce a bountiful harvest.
Futures prices for corn have been fluctuating more dramatically this season than last season.
The rain that meteorologists predicted for tomorrow is expected to extend well beyond the corn-growing region.
Agriculture experts announced today that a disease that has devastated some of the corn crop will spread widely before the end of the growing season.
Most people who trade in corn futures rarely take physical possession of the corn they trade.
A 为什么不对，不是应该选下雨但也不一定导致丰收的选项吗？D虽然也说明不一定丰收，甚至可能收成不好，导致价格上涨，但是D与气象学家的预测不相关呀。请老师解答，谢谢。
选项A是加强吧
A是质疑了题干
我的理解是，这明显是一道原因结构的题目，therefore，后面直接是since加原因，那么一般削弱这类题的最好方法是找他因，D的他因非常直接，而A选项你并不知道明天是不是在这个pollination stage里面。
A没毛病啊，说在传粉期没有湿气长不好，但是根据题目有很多雨，那么不可以削弱结论
A选项说during its critical pollination stage 但段落中没有提到现在crops在哪一个阶段 所以A不能影响结论。
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