[求助]GWD-28-28

可是C 中并没有说others of the closely related group of plants 生长在含大量metal 的土壤中啊，新东方的答案的确给的是E

我的理解是这样的：

一些植物生长在含大量metal的土壤中而不死的原因是分泌histidine

即：高histidine----->在高metal 土壤中生长

d 恰恰说反了，说的是high metal--->high histidine

e 偶也觉得有点疑惑，是说生长---->histidine下降 则表明plant 在生长过程中是消耗histidine吗？

还请牛牛指教！

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 ______.

C: others of the closely related group of plants are also found to produce histidine in large quantities 从C可以得出，这类植物都有一个共同点。

当一类事物中有一个共同点（而且已经证明，这类事物中的一个事物的该共同点对事物的特征有作用，即： large amounts of histidine, an amino acid that, in test-tube solutions, renders these metals chemically inert.），且这类事物表现出一个共同的特征（a group of closely related plants that thrive in soil with high concentrations of metals that are toxic to most other plants.）。

那么，你能推出什么呢？

可能就是这个共同点造成了这个共同的特征。所以支持结论。

题干中的：large amounts of histidine, an amino acid that, in test-tube solutions, renders these metals chemically inert. 不就是证明吗？

E 应该是无关选项。既不支持，也不削弱结论。