单项选择题

The Allied advantage in the air gradually increased thereafter and became _______ when the Unit ed States entered the war in 1917.

A．preoccupying
B．embarrassing
C．overwhelming
D．counseling
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单项选择题
At the same time, the _______ causes for known declines and disappearances of species often involves experimentation, data analysis, and scientific detective work.
A．identifying
B．pondering
C．nourishing
D．simplifying
单项选择题
The _______ cause of laying off skilled workers in the factory was bad management.
A．negative
B．negligible
C．prevalent
D．prime
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