单项选择题

The child's abnormal behavior puzzled the doctor.

A．bad
B．frightening
C．repeated
D．unusual
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单项选择题
We also want to use the water to irrigate barren desert land.
A．hairless
B．bare
C．empty
D．bald
单项选择题
There is an abundant supply of cheap labor in this country.
A．a steady
B．a plentiful
C．an extra
D．a meager
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