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 - answer 这题选E对吗?题目是说 要support, 而E说当植物成熟后,histidine的浓度就会下降,那不就说明这个植物能在金属土地中生存不是因为histidine的作用吗?那就是削弱了.应该选C吧.请NN出来讲解下好吗?快考试了,好紧张.
PSZ谢谢你的JJ,加油!!!有个问题,你的CR JJ 总结是下哪个版本的?我看你的编号有70多题,而我手上的版本只有50多题,可否上传分享下?谢谢 |