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
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
The city has decided to do away with all the old buildings in its center.
A. get rid of
B. set up
C. repair
D. paint
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