单项选择题

Most surveys find that people are reluctant to place themselves at either the top or the bottom of the social ladder.

A．uncommon
B．uncertain
C．unwilling
D．voluntary
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单项选择题
One of the most common symptoms of schizophrenia is hearing imaginary voices.
A．changes in body
B．terrible headaches
C．financial problems
D．emotional sufferings
单项选择题
The board of directors required that Mr. Brown expensive equipment justify buying at a time when the company was practicing strict economy.
A．give reasons for
B．verify
C．testify
D．give evidence about
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