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标题: GWD-31-Q17 有没有答案？请牛牛帮忙分析啦 [打印本页]

作者: carolcai 时间: 2008-5-24 08:33
标题: GWD-31-Q17 有没有答案？请牛牛帮忙分析啦

It is crucially important to farmers that the herbicides they use to control weeds not (?) damage their crops. One very effective herbicide is safe for corn, but soybeans are damaged even by the herbicide’s residue, which remains in the soil more than a year after the herbicide is applied. Soybeans and corn are not sown together in the same filed; nevertheless, most farmers are reluctant to use the herbicide on their corn.

Which of the following, if true, provides the strongest justification for the farmers’ reluctance?

A: The residue of the herbicide in the soil a year after application is not enough to control most weeds effectively.

B: To maintain the nutrients in the soil, corn and soybeans are often planted in a field in alternate years.

C: The demand for soybeans is growing faster than is the demand for corn.

D: For maximum yield, soybean plants are grown closer together to each other than are corn plants.

E: The application of herbicides is less critical for soybean than for corn cr

作者: hansomecd 时间: 2008-5-24 09:55

题目中指出:虽然并不种植在一起,但是农民也不愿意用伤害corn而有利于soybeans的农药

B:planted alternate years 指出corn和soybeans的联系, 解释了dilemma

作者: woodsender 时间: 2008-5-25 16:33

只有种植在一块地上才有影响，轮植（planted in a field in alternate years）将会产生这种影响

作者: carolcai 时间: 2008-5-27 17:43
哦，多谢大侠

作者: lzj1209 时间: 2009-11-30 17:27

A. To maintain the nutrients in the soil, corn and soybeansare often planted in a field in alternate years.（两种作物通常在一个田里in alternate years种植，也就是相继种植。——那么在corn上喷洒了农药，由于在农药喷洒一年后，伤害soybeans的herbicide’sresidue仍然还残留在土壤中，所以会对接下来将要种植的soybeans产生破坏，所以农民不愿再corn上用农药。——给出原因。）

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