单项选择题

How many common forms of sugar are exemplified in this passage

A．One.
B．Two.
C．One hundred.
D．Several hundreds.
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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 food.
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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