Insect infestations in certain cotton-growing regions of the world have caused dramatic increase 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 being 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 year 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. 答案是B，为什么D不可以呢，那样不是还是赚不到钱嘛作者: Rebeldom 时间: 2010-5-10 17:45
虽然我第一感觉也选的是B, 你这么一说的确又有些道理, 我只能说说我的想法吧, 根据我的理解,通常出题都是在本身的条件里面找缺陷,比如之中提到了虫害的问题,所以B选项解决了虫害的问题,从根本上使得结论不能成立 而D选项加入了新的条件