单项选择题

Great efforts to increase wheat production must be made if bread shortages ______ avoided.

A．will be
B．can be
C．are to be
D．were to be
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单项选择题
Most of the earliest ______ into America came from Europe.
A．migrants
B．emigrants
C．immigrants
D．inhabitants
单项选择题
By cutting down trees we ______ the natural home of birds and animals.
A．harm
B．hurt
C．injure
D．damage
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