单项选择题

The utilities' charts show that the ______ majority of air pollution in the region results from natural dust.

A．overwhelming
B．overthrowing
C．overflowing
D．overturning
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单项选择题
When a number of people ______ together in a conversational knot, each individual expresses his position in the group by where he stands.
A．accumulate
B．pack
C．squeeze
D．cluster
单项选择题
There's a ______ in the fact that although we're living longer than ever before, people are more puzzled by health issues than they ever were.
A．analogy
B．paradox
C．dilemma
D．illusion
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