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
In today's rapidly changing economy, opportunities ______ for those who are motivated and dedicated to achieving their career goals.
A．abound
B．refrain
C．transcend
D．uphold
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