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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单项选择题
When a psychologist does a general experiment about the human mind, he selects people ______ and asks them questions.
A．at random
B．at will
C．at length
D．in essence
单项选择题
Only under special circumstances ______ to take make-up tests.
A．freshman are permitted
B．are freshman permitted
C．permitted are freshman
D．are permitted freshman
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