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
Attempts to persuade her stay after she felt insulted were ______.
A．of no avail
B．out of focus
C．queerly
D．in no way
单项选择题
He is believed to have been shot by a rival gang in ______ for the shootings last week.
A．revenge
B．reserve
C．reverse
D．remedial
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