单项选择题

During the past ten years there have been dramatic changes in the international situation.

A．permanent
B．powerful
C．striking
D．practical
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单项选择题
A new system of quality control was brought in to overcome the defects in the firm's products.
A．invested
B．introduced
C．installed
D．insisted
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 stable
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