标题: 求指导：GWD8-40 [打印本页] 作者: Sissijc 时间: 2010-7-20 14:43 标题: 求指导：GWD8-40 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. 我选的是D 答案却是B 我怎么觉得B有点削弱前提的样子 如果是D的话，需求量没有增加 即使价格高了也不是都卖不出去 不是也说得通么？ 大家来帮帮忙哈！作者: wz881016 时间: 2010-7-20 16:22
种SOYA的人之所以去种COTTON主要是因为COTTON因为虫子泛滥所以价格上升，要削弱它就找让他价格下来种SOYA的人就不会去种COTTON了所以选B。选D的话不能阻止种SOYA的去种COTTON，因为COTTON价格还是高的。作者: Sissijc 时间: 2010-7-21 10:21