单项选择题

Why should we increase the production of sugar

A．It tastes sweet.
B．We can save plenty of land.
C．We can get more energy.
D．It is one of the most highly concentrated of energy foo
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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 prunin
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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