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
George was introduced to ______ activities at a young age, when he was hired to act as a lookout for drugdealers.
A．illegal
B．lawful
C．faithful
D．peaceful
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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