单项选择题

In the last few minutes the conversation has become seemingly ______ as if the discussion were of some minor domestic matte r and not survival itself.

A．crucial
B．central
C．casual
D．causal
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单项选择题
I didn't listen to Mom and I was not surprised at the look of ______ on her face.
A．take up
B．compliment
C．negligence
D．reproach
单项选择题
Many people think of deserts as ______ regions, but numerous species of plants and animals have adapted to life there.
A．remote
B．virgin
C．alien
D．barren
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