单项选择题

Even a very young animal has a strong ______ for self-preservation.

A．consciousness
B．impulse
C．instinct
D．response
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单项选择题
Hikers and campers often become infected by drinking water from ______ streams.
A．configured
B．insulted
C．contaminated
D．condemned
单项选择题
The parties can also provide ______ for facilitating cooperation and regulating conflict among different parties.
A．appliances
B．mechanisms
C．organisms
D．accessories
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