CR9.7 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.

此题我选择的答案是C，我认为cotton需求量不变，而改种cotton的人增多了，价格就会下降所以就削弱了成功的可能。B为什么比C 更优？

我的解答：