※ 引述《surfingdream (好多东西)》之铭言： : 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 : 我选(C) 感觉是对照组支持 : 来欣的答案好像给E，是我抄错了吗？ 网路上找了一下 有人说答案是C : 注：来欣是随堂测验的 FORM A05第11题 在TestMagic看到一位大牛他选C，解释如下 The correct response is C. The evidence is: 1. This herb is one of a group of closely related plants that grow in metal-rich soil. 2. This herb produces large amounts of histidine, which in the lab renders the metals chemically inert. The hypothesis is: The herb's high histidine production is what allows it to grow in metal-rich soil. Choice C says that other plants that grow in metal-rich soil also exhibit with high histidine production. This fact would support the hypothesis because it would strenthen the connection between histidine production and the ability to grow in metal-rich soil. 我觉得有道理，可否解释一下 E那边支持原文？ (E)its taking the assumption , at maturity the amino acid produced reduces! it assumes that the death of a plant can be only bcas of the acid factor in the soil, which need not be true. --

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