题目信息

Which of the following most logically completes the argument?

A certain cultivated herb is one of a group of closely related plants that thrive in soil with high concentrations of metals that are toxic to most other plants. Agronomists studying the herb have discovered that it produces large amounts of histidine, an amino acid that, in test-tube solutions, renders these metals chemically inert. Possibly, therefore, the herb's high histidine production is what allows it to grow in metal-rich soils, a hypothesis that would gain support if ______.

A:histidine is found in all parts of the plant-roots, stem, leaves, and flowers
B:the herb's high level of histidine production is found to be associated with an unusually low level of production of other amino acids
C:others of the closely related group of plants are also found to produce histidine in large quantities
D:cultivation of the herb in soil with high concentrations of the metals will, over an extended period, make the soil suitable for plants to which the metals are toxic
E:the concentration of histidine in the growing herb declines as the plant approaches maturity
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正确答案: C:others of the closely related group of plants are also found to produce histidine in large quantities

【题目解析】:虽然与环绕地球轨道上的小块碎片的数目相比,环绕地球运转的大型人造卫星的数目小,但是大型卫星对于望远镜观测的干扰更严重,因为他们产生强烈的反射。因为许多这样的大型卫星已经停止运作,最近有建议提出将这些没有运作的大型卫星炸掉,以消除对于观测的干扰。然而这个建议是拙劣的,因为:

【选项解析】:

A选项让炸掉卫星的政策更合理,与文章观点相反。不运作的卫星呆在轨道上不离开,又对观测有影响,就需要炸掉。

B选项同上。修理成本太高,难以负担,还不如炸掉。

C选项没有对文章结论起到支持作用。没有先例不能说明不该炸掉卫星。

D选项说明有其他方式排除观测干扰,但是不能说明炸掉卫星的建议不合理,炸掉卫星也能起到排除干扰的作用。D选项建议了其他方式,但没有就炸掉卫星所起的负面作用原因作出分析

E 正确。直接说明炸掉卫星带来的小碎片可能对观测产生更严重的干扰,也就体现出为了排除干扰炸掉卫星是不合理的,不能达到期望的效果,反而更糟



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