单项选择题

Speech is the ________ ability possesed only by human beings.

A．average
B．unique
C．collective
D．single
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单项选择题
After a few months, they became ________ to the new environment.
A．interested
B．confident
C．accustomed
D．happy
单项选择题
It________ without saving that consumers would be happier if prices were lower.
A．takes
B．appears
C．makes
D．goes
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