单项选择题

Some parents are only concerned ______ their children's grades in studies.

A. of
B. at
C. about
D. for
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单项选择题
The toy maker produces a ______ copy of the space station, exact in every detail.
A. minimal
B. minimum
C. miniature
D. minor
单项选择题
We had a ______ lesson in ideological education yesterday and were deeply impressed.
A. profound
B. deep
C. extreme
D. shallow
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