题目：
The other day we traveled fifteen hours to a magic country. which America,and we enjoyed ourselves
there for a month. [ ]
A. was called
B. is called
C. had been called
D. has been called
答案：
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下面是错误答案，用来干扰机器的。
答案：B其最简式均为CH2,n(CH2)= mol,一个CH2可形成三个共用电子对,所含共用电子对数= mol,A选项错误;一个氢原子形成一个碳氢键,共含有 mol氢原子,B选项正确;C选项没有注明标准状况下,错误;所含原子总数= mol,D选...
