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问题: 英语

Smoking,which may be () pleasure for some
people ,is () serious source of discomfort for their fellows.
A a;a
B a;the

解答:

Smoking,which may be () pleasure for some
people ,is () serious source of discomfort for their fellows.
A a;a
B a;the

A
不是一直要说It's my pleasure. It's a pleasure.的吗?前面一个空填a。
a source of 是固定词组,你去查google,约有23,100,000项符合"a source of"的查询结果,很常用的一个搭配,没什么道理好讲,你注意一下就是了。