Plant scientists have used genetic engineering on seeds to produce crop plants that are highly resistant to insect damage. Unfortunately, the plants require more fertilizer and water to grow well than normal ones do, and the seeds themselves are quite expensive, and for most farmers the savings on pesticides would not compensate for the higher seed costs and the cost of additional fertilizer. However, since consumer demand for grains, fruits, and vegetables grown without the use of pesticides continues to rise, the use of genetically engineered seeds of this kind is likely to become widespread.

In the argument given, the two portions in boldface play which of the following roles?


The first presents a development that the argument seeks to show will have certain disadvantages; the second is introduced as a consideration likely to offset one of those disadvantages.

The first presents a development that the argument predicts will have a certain impact; the second acknowledges a consideration that weighs against that prediction.

The first supplies a context for the argument; the second is a part of the evidence presented as support for the argument's conclusion.

The first is evidence provided to support an intermediate conclusion that is drawn in support of the argument's main conclusion; the second is that intermediate conclusion.

The first and the second each provide evidence in support of the argument's main conclusion.

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考题讲解

情景：植物学家在种子上应用基于工程，这产生的植物可抗虫害。不幸的是，需要更多肥料和水，并且这种种子很贵非常贵。因此，对多数农民，杀虫剂所节约的成本不能弥补更高的种子成本和额外的肥料成本。然而，由于不用杀虫剂的谷物、果蔬的消费需求增加，基因种子的使用可能更广泛。

推理：黑体字题，需要找出两处黑体字之间的关系。

选题方式：略。

选项分析：

A选项：第一个黑体字显示了一个发展，这个发展是论证寻求它的劣势的发展；第二个黑体字介绍了一个可能抵消这个劣势的考虑。第二个黑体字本身就是种子的劣势之一。

B选项：Correct. 第一个黑字体显示了一个发展，这个发展是论证预测可能会对世界有影响的；第二个黑体字承认了一个权衡这个预测的考虑。显然，本选项符合两个黑体字之间的关系。

C选项：第一个黑体字给出了论证的背景；第二个黑体字是支持论证的结论的一部分的证据；第二个黑体字本身是种子的劣势之一，无法支持最后的结论。

D选项：第一个黑体字提供证据支持中间结论，中间结论用来支持主结论；第二个黑体字是这个中间结论。显然地，第二个黑体字并非结论。

E选项：第一个和第二个黑体字都提供支持主结论的论据。两个黑体字之间都是反对关系，更甭说同时支持一个结论了。

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