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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单项选择题
Cement was seldom used in building during the Middle Ages.
A．crudely
B．rarely
C．originally
D．symbolically
单项选择题
Her behavior is extremely childish.
A．simple
B．immature
C．beautiful
D．foolish
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