[求助]快考了，求助一逻辑题

西哈克

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?

 

1. The cost of raising soybeans has increased significantly over the past several years and is expected to continue to climb.

2. 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.

3. In the past several years, there has been no sharp increase in the demand for cotton and for goods made out of cotton.

4. Few consumers would be willing to pay significantly higher prices for cotton goods than they are now paying.

5. The species of insect that has infested cotton plants has never been known to attack soybean plants.

 答案是B，我选的D，请XDJM帮忙分析。谢谢

西哈克

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?

 

1. The cost of raising soybeans has increased significantly over the past several years and is expected to continue to climb.

2. 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.

3. In the past several years, there has been no sharp increase in the demand for cotton and for goods made out of cotton.

4. Few consumers would be willing to pay significantly higher prices for cotton goods than they are now paying.

5. The species of insect that has infested cotton plants has never been known to attack soybean plants.

 答案是B，我选的D，请XDJM帮忙分析。谢谢

边距没调整好，重发一遍

racheldeng

我谈谈我的看法。问题出在第一句话：由于害虫的大肆侵犯导致了棉花市场的价格上涨，所以D应该是无关选项，而B的意思就是说，高效杀虫剂的问世可以控制害虫肆虐，棉花产量稳定了，棉花市场的价格就会下降，那么农民种植棉花的积极性也就降低了。

希望对你有帮助。