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
These pollutants can be ______ hundreds and even thousands of kilometers by large air masses.
A．contained
B．conveyed
C．contaminated
D．conserved
单项选择题
In a divorce, the mother usually is granted ______ of her children.
A．support
B．retention
C．perseverance
D．custody
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