单项选择题

As a salesman, he works on a （） basis，taking 10% of everything he sells．

A．revenue
B．commission
C．salary
D．pension

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单项选择题
Some authorities trace the jury system to Anglo Saxon or even more ______ Germanic times.
A. remote
B. similar
C. austere
D. barbaric
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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