单项选择题

Their endeavor and _______ to "get ahead" have produced some excellent results.

A．assassination
B．ammunition
C．auction
D．ambition
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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
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
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