单项选择题

Why is a special substance painted on the tree

A．To make a wound smooth.
B．To prevent disease entering a wound.
C．To cover a rough surface.
D．To help a wound to dry.
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单项选择题
Why did the beat generation refuse to cooperate with society
A．They had no interest.
B．They found hard to cooperate with it .
C．The laws block their way to do so.
D．They thought their need was neglecte
单项选择题
Based on the passage, how many of one hundred and twenty American couples of the beat generation practiced cohabitation
A．About 20 couples.
B．About 30 couples.
C．About 60 couples.
D．About 40 couples.
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