单项选择题

The only safe way of distinguishing between edible and poisonous mushrooms is to learn to （） the individual species．

A．identify
B．classify
C．isolate
D．separate

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单项选择题
Mercury is the nearest planet to the sun and its period of （） is 88 days.

A．movement
B．evolution
C．return
D．revolution
单项选择题
Hydrogeology is the study of water and its properties, including its ______ and movement in and through land areas.
A. flow
B. absorption
C. distribution
D. evaporation
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