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
Since the Great Depression, the United States government has protected farmers from damaging drops in grain prices.
A. slight
B. surprising
C. sudden
D. harmful
单项选择题
The government is debating the education laws.
A. discussing
B. defeating
C. delaying
D. declining
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