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题库 / OG2019-CR-553
Plant scientists have used genetic engineering on seeds to produce crop plants that are highly resistant to insect damage. Unfortunately, the seeds themselves are quite expensive, and the plants require more fertilizer and water to grow well than normal ones. Accordingly, 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 supplies a context for the argument; the second is the argument’s main conclusion.
The first introduces a development that the argument predicts will have a certain outcome; the second is a state of affairs that, according to the argument, contributes to bringing about that outcome.
The first presents a development that the argument predicts will have a certain outcome; the second acknowledges a consideration that tends to weigh against that prediction.
The first provides evidence to support a prediction that the argument seeks to defend; the second is that prediction.
The first and the second each provide evidence to support the argument’s main conclusion.
情景：科学家在种子上使用了基因技术为了培育出可以抵抗虫害的农作物。不幸的是，这种种子本身很贵，并且比普通种子需要更多的肥料和水。因此，对大多数农民来说在杀虫剂上省下的钱根本抵不上高价种子和肥料的成本。然而，因为消费者对无公害作物的需求增加，这种新型种子应该会被广泛使用。
推理：整段话以however为分界线，however后面为前提和主结论。第一个黑体句是整段话的一个背景，第二个为反驳结论的。
选项分析：
A选项：第一句话提供了背景，第二句为主结论：第二个并不是主结论.
B选项：第一句引入了一个后文预测会有一个结果的发展，第二句为得出那个预测结果做出了贡献：后文提到的结果即“种子会被广泛使用”，但第二句是不支持这个结论的。
C选项：正确。第一句引入了一个后文预测会有一个结果的发展，第二句提出了一个发对那个预测的观点。
D选项：第一句提出了一个支持全文赞同的预测的证据，第二个就是那个预测：第二个并不是全文都赞同的预测。
E选项：两句都是支持主结论的证据：第二句并不是支持主结论的。
The first introduces a development that the argument predicts will have a certain outcome;
development是科学家研究了转基因种子。outcome就是农民会种这个种子。
以however为分界线，however后面为前提和主结论。第一个黑体句是整段话的一个背景，第二个为反驳结论的。