GWD-10-Q40:

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.

Answer:B  But personally, I prefer D, which means that high priced cotton will not get market, let alone high profit for planters.

选B

B中说有了可以控制虫害的新方法，因为原文中开头变限定了导致棉花价格升高的因素就是虫害，因此虫害问题解决了，棉花价格就不会升高，值得注意的是不要妄自想象其他因素也会使价格升高

D中说很少有人愿意花更多钱买棉花产品，大家一定要注意是cotton goods不是cotton，这和原文是没有关系的!消费者不愿意花更多钱买棉花产品，那就意味涨钱后的棉花没有市场了么？棉花没有市场了就一定会降价么？你只是把你认为的市场规律套进了题目，题目从头到尾都没有给过这些问题肯定答案！

就像买楼，楼价这么贵，早偏离了价值，但还是很多投机者买啊，你认为的市场规律在题目中没确认的情况下，就是无效规律！