种棉花的问题

半夏冬忍 · 发表于 2017-3-27 20:28:37

Insect infestations in certain cotton-growing regions of the world have caused dramatic increases in the price of cotton on the world market. By contrast, the price of soybeans has long remained stable. Knowing that cotton plants mature quickly, many soybean growers in Ortovia plan to cease growing soybeans and begin raising cotton instead, thereby taking advantage of the high price of cotton to increase their income significantly, at least over the next several years.

Which of the following, if true, most seriously weakens the plan’s chances for success?

A. The cost of raising soybeans has increased significantly over the past several years and is expected to continue to climb.
B. Tests of a newly developed, inexpensive pesticide have shown it to be both environmentally safe and effective against the insects that have infested cotton crops.
C. In the past several years, there has been no sharp increase in the demand for cotton and for goods made out of cotton.
D. Few consumers would be willing to pay significantly higher prices for cotton goods than they are now paying.
E. The species of insect that has infested cotton plants has never been known to attack soybean plants.
能明白B是直接从根上削弱，引入杀虫剂消灭虫子感染了，那棉花的价格就不会升高，那农民种棉花就没用了
错选D 消费者不愿意买需求少了那棉花卖不出去农民的收入也不会增加啊？
求大神指点~

spings · 发表于 2017-3-27 21:41:41

D的错误在于没有弄明白，题目是对未来成功概率的削弱，而D和未来成功的概率没有直接关系，说的就是现时的状态。

半夏冬忍 · 发表于 2017-3-29 10:48:26

spings 发表于 2017-3-27 21:41
D的错误在于没有弄明白，题目是对未来成功概率的削弱，而D和未来成功的概率没有直接关系，说的就是现时的状 ...

好哒谢谢！

种棉花的问题

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