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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单项选择题
He is a hypocrite, a liar, a thief—______, he is the greatest devil I ever know.
A．as a consequence
B．as a rule
C．as a matter of fact
D．as a matter of routine
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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