单项选择题

These pollutants can be ______ hundreds and eve thousands of kilometers by large air masses.

A．contained
B．conveyed
C．contaminated
D．conserved
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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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