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发布时间：2006-06-22 13:16     点击：

Those strawberry growers in Miller County who last

year treated their strawberry fields with a certain

fungicide report that this year strawberry plants will

not grow in the treated fields. Yet, since crop failures

have also occurred this year in adjacent, untreated fields,

it is obvious that the fungicide is not responsible for

this disaster.

　

Which of the following, if true, most seriously weakens

the argument above?

Within weeks after spraying, the fungicide breaks

　down into a number of simple compounds that have no

　antifungal effect.

The fungicide is normally sprayed on fields only

　toward the end of the growing season after the straw-

　berries have begun to ripen.

Farmers in Miller County who last year used a

　fungicide chemically similar to that used on the

　affected strawberry fields have reported no significant

　crop losses this year.

The crop failures in the adjacent, untreated fields

　were as serious as those that occurred in the treated

　fields.

After being sprayed on crops, the fungicide travels

　easily through irrigation systems from field to field.

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答案：(E)

问题：下面哪一个，if true,最削弱上面的论述？

读题：去年Miller县的草莓种植园主用某种杀菌剂治疗草莓地，今年他们报告说这些地里

　　　种植的草莓树无法生长。但是，由于今年附近没有用杀菌剂的地里也出现欠收，

　　　很明显杀菌剂不是这次欠收的原因。

　

分析：象这种什么不是什么的原因，往往是考间接原因的一种体现。

反对达到的效果：杀菌剂就是欠收的原因。

间接原因的固定解法如下：A是B的原因，所以A就不是C的原因，反对只要说B和C是相关的

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