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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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
单项选择题
There was another innovation in 1941, unique because it was _______ by the labor union of the dress industry,
A．conceived
B．conserved
C．deserved
D．preserved
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