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
What was the author’s purpose when writing this passage
A．To give practical instruction for pruning a tree.
B．To give a gardener description of pruning.
C．To explain how trees develop disease.
D．To discuss different methods of pruning.
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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