以下是引用yaoyao99在2006-6-5 5:41:00的发言: Just for fun, let's look at the other choices:
A. Where histidine is found is irrelavant to its effect. 排除 B. The production of other amino acids is not discussed. 排除 D. The effect that the herb has on the soil is irrelavant to the hypothesis concerning why it can survive in the soil. 排除 E. The change in concentration is irrelavant to the hypothesis concerning the effect of high concentration. 排除