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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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
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
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