问题
单项选择题
Which of the following best describes the organization of the passage
A．The results of two experiments are compared.
B．A generalization is made, and several examples of it are given.
C．The findings of an experiment are explained.
D．A hypothesis is presented, and several means of proving it are suggested.
答案
参考答案：C
解析：[分析] 主旨题型。 第二段第一句为本文的主旨。而这是植物生理学家通过研究种植在实验瓶中的根，及在此基础上研究根、芽作为植物整体间的关系取得的；本文对此作了较详尽的解释。因此选项C为答案。