单项选择题

Living in the desert of Africa has its problems; obtaining fresh water is not the least.

A) with which
B) for which
C) of which
D) which
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—Could you put on your earphone — ______ . Is it disturbing you
A) Take it easy B) I'm sorry
C) Not a bit
D) It depends
单项选择题
Yesterday I met' an old friend of mine by ______, which was really a pleasant surprise.
A) occasion
B) accident
C) way
D) purpose
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