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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.
根据结论的具体性和特殊性，直接排除B,C,E,→其中，我对C最初有些理解错误，其表达的意思是雨水范围超过谷物生长区，而不是雨水量，还是审题不够仔细
这是个因果型结论，湿度充分→谷物产量丰富→谷价下跌
要weaken它：①其他原因；②有因无果或有果无因；③因果关系颠倒；④证明因果关系的资料数据无效。D显然属于其他原因，是一定会导致谷物产量下跌，谷价不会下跌；A属于对因果关系的质疑，没在关键时期受到充分的湿度就会导致产量下降，文中并没有提到现在是否属于关键时期 ，湿度对于产量的影响不一定。CR weaken是要求完全否定，故排除A。
→连续两次栽在这个错误的逻辑思路上了，一定要记得是完全否定！！！
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