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
There is an abundant supply of cheap labor in this country.
A. a steady

B. a plentiful
C. an extra D. a stable
单项选择题
The index is the government's chief gauge of future economic activity.
A. measure
B. opinion
C. evaluation
D. decision
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