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
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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
Many scientists ______ the new damage to the forests to be the result of higher levels of pollution.
A．resumed
B．perfumed
C．presumed
D．consumed
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