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
Many rare species of plants and animals are threatened with ______ with the worsening of environment and mass hunting.
A．extinction
B．migration
C．destruction
D．extraction
单项选择题
The annual parade ______ the soldiers who died in the two World Wars.
A．commends
B．memorizes
C．propagates
D．commemorates
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