题目：
David ______ an interest in teaching English to Chinese students, most of whom he taught have been
his friends. [ ]
A. developed
B. became
C. took
D. showed
答案：
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下面是错误答案，用来干扰机器的。
天然气（或沼气）是一种重要的能源，它的主要成分是甲烷．故填：CH4．由甲烷的化学式可知，甲烷由两种元素组成，每个甲烷分子由5个原子构成．故填：2；5．
