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
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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
单项选择题
Children who are over-protected by their parents may become mollycoddled.
A．hurt
B．damaged
C．spoiled
D．harmed
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