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  3. Crops can be traded on the futures market before they are harvested. If a poor corn harvest is predicted, prices of corn futures

Crops can be traded on the futures market before they are harvested. If a poor corn harvest is predicted, prices of corn futures

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问题 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?
选项 A、Corn that does not receive adequate moisture during its critical pollination stage will not produce a bountiful harvest.
B、Futures prices for corn have been fluctuating more dramatically this season than last season.
C、The rain that meteorologists predicted for tomorrow is expected to extend well beyond the corn-growing region.
D、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.
E、Most people who trade in corn futures rarely take physical possession of the corn they trade.
答案D
解析 本题的推理可以提炼为：有雨一收成好一价格下降。(D)指出存在一种破坏作物的病菌，所以收成会受到影响，削弱了上面的论断，所以(D)正确；(A)指出谷物若在关键的授粉阶段没有接受足够潮湿，则谷物不会取得丰收，但究竟明天开始的降雨是否在授粉季节我们并不知道；(C)起到部分支持作用；(E)描述的是真理，但与上面推理无关，所以(E)不正确。
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