单项选择题

Speech is the ______ability possessed only by human beings.

A．unique
B．average
C．collective
D．single
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单项选择题
If your ______lively pets become passive, they might be ill.
A．traditionally
B．rarely
C．normally
D．continually
单项选择题
After a few months, the immigrants became ______to the new environment.
A．confident
B．sick
C．happy
D．accustomed
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