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本题由chris提供
1474 次学习

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?


    A. 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.

    B. The first presents a development that the argument predicts will have a certain impact; the second

    acknowledges a consideration that weighs against that prediction.

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

    D. 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.

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


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答案:
B
植物学家用
基于工程在种子上,产生的植物可抗虫害。不幸的是,需要更多肥料和水,这种种子很贵非常贵。因此,对多数农民,杀虫剂的节约不能补偿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。 黑体题 两黑体间有Unfortunately, 所以是转折关系,第一黑体是一种预测的一种发展,第二黑体是反对这种预测 A. 第一黑体显示了某种弱点的发展,第二黑体抵消弱点; 第二黑体就是弱点,排 B. 符合分析,正确 C. 第一黑体是背景,第二黑体支持结论的一部分;第二黑体支持的是中间结论,而不是最终结论,排 D. 第一黑体提供证据支持中间结论,中间结论用来支持主结论;中间结论和主结论是反对关系;且第二黑体不是中间结论,而是论据,排 E. 第一第二黑体提供支持主结论论据;两黑体是反对关系,排

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