It is crucially important to farmers that the herbicides they use to control weeds do not damage the...

题目信息

It is crucially important to farmers that the herbicides they use to control weeds do 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 field; 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 crops.

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

这道题是典型的fill the gap。C按照原文的条件，因为soybean 和 corn不被种在一个field而且soybean的demand很高，那农民完全可以在种soybean的field里面扩大soybean的种植，不需要考虑corn的heribicide这个因素。

B正确。要reason农民不用corn herbicide这个behavior, 必须附加一个条件去建立soybean, corn和corn herbicide之间的联系。选项B很好得做到了这一点：因为corn和soybean是在一个field里面年复一年交替种植的，所以corn herbicide的residue是会影响到soybean的。

笔记