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
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 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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