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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: boussoler    时间: 2008-6-25 07:08     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: detectiveyang    时间: 2008-6-25 20:15

B

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: qwrtfdse    时间: 2008-6-26 20:24

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: boussoler    时间: 2008-6-28 20:09

两月前, 好像自己钻牛角尖了. 现在看OG的解释多清楚啊!

感谢大家!


作者: boussoler    时间: 2008-7-1 20:08

哦,多谢大侠!!!!!!!!!!!!!!!
作者: Springwaters    时间: 2008-12-10 10:40

QUOTE:
以下是引用qwrtfdse在2008-6-26 20:24:00的发言:
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

 

good,  thanks!


作者: alice2292    时间: 2008-12-10 11:53

QUOTE:
以下是引用boussoler在2008-6-28 20:09:00的发言:

两月前, 好像自己钻牛角尖了. 现在看OG的解释多清楚啊!

感谢大家!

[em10]






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