单项选择题

A．of
B．about
C．to
D．within
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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
A．successfullyB．skillfullyC．wonderfullyD．poorly
A．successfully
B．skillfully
C．wonderfully
D．poorly
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