单项选择题

Hikers and campers often become infected by drinking water from ______ streams.

A．configured
B．insulted
C．contaminated
D．condemned
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单项选择题
The American dream is most ______ during the periods of productivity and wealth generated by American capitalism.
A．patriotic
B．plausible
C．primitive
D．permissible
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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