单项选择题

The study also notes a steady decline in the number of college students taking science courses．

A．relative
B．general
C．continuous
D．sharp
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单项选择题
His shoes were shined to perfection．
A．cleared
B．washed
C．mended
D．polished
单项选择题
We have to act within the existing legal framework．
A．system
B．limit
C．procedure
D．status
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