单项选择题

Why should pruning be done

A．To make the tree grow taller.
B．To improve the shape of the tree.
C．To get rid of the small branches.
D．To make the small branches thicker.
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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.
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
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