Insect infestations in certain cotton-growing regions of the world have caused dramatic increases in the price of cotton on the world market. Knowing that cotton plants mature quickly, many soybean growers in Ortovia plan to cease growing soybeans, the price of which has long been stable, and to 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 calls into question the reasoning on which the plan is based?
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 infected 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. Many consumers consider cotton cloth a necessity rather than a luxury and would be willing to pay significantly higher prices for cotton goods than they currently pay.
E. The species of insect that has infested cotton plants has never been known to attack soybean plants.
答案就是B 我选的也是B ，但是为什么C不对呢？作者: queenie924 时间: 2010-8-21 21:56
C中的In the past several years 没什么关吧~过去不能推到将来~是不~