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?
这个题目答案选择 B..我觉得B不够正确。。。。。
请求高手指点
In original argument:
Insect infestations in certain cotton-growing regions of the world have
caused dramatic increases in the price of cotton on the world market.
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.
Once B is true, the condition mentioned in the original argument
contributing to high cottone price will not stay valid any more. Therefore
the price of cotton will fall. Thus there will be no way for growers
switching from soybean to cotton to make profits as they planed.
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