单项选择题

The old concerns lose importance and some of them vanish altogether.()

A. develop
B. disappear
C. link
D. renew

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单项选择题
These factors interact intimately and cannot be separated.()

A. tensely
B. nearly
C. carefully
D. closely
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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