单项选择题

The ______ of AIDS has led to an expansion in research seeking a cure.

A．innovation
B．selection
C．proliferation
D．conviction
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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
单项选择题
Most of the earliest ______ into America came from Europe.
A．migrants
B．emigrants
C．immigrants
D．inhabitants
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