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
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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
单项选择题
Police ______ the crowds with teargas, and tanks were stationed in the city.
A．removed
B．showered
C．detached
D．dispersed
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