单项选择题

According to American federal government, residents of Hawaii have the longest life ______: 77.2 years.

A．rank
B．scale
C．span
D．scope
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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
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
D．make sense of
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