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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I don't quite follow what she is saying.
A. observe
B. understand
C. explain
D. describe
单项选择题
Cement was seldom used in building during the Middle Ages.
A. crudely
B. rarely
C. originally
D. symbolically
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