单项选择题

Electrical appliance such as toasters or hair dryers are designed to ______the ability of an electric current to heat a wire.

A．take the risk of
B．take advantage of
C．take responsibility of
D．make sense of
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单项选择题
Since 1945, the rivalry in military strength between the world's great powers has produced a balanced peace.
A．contemporarily
B．predictably
C．temporarily
D．previously
单项选择题
They stayed up late trying to ______out a way to solve the problem.
A．let
B．give
C．knock
D．figure
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