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
Winston Churchill firmly ______ his announced aim of winning the war.
A．adhered to
B．referred to
C．saw to
D．catered to
单项选择题
He would never forget the hardships he witnessed during the Great ______ of the 1930s.
A．Unemployment
B．Starvation
C．Depression
D．Renaissance
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