题目内容

45()

A. teaching
B. instructive
C. constructive
D. illuminating

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52()

A. up to
B. into
C. down
D. inside

According to Para. one, experts have interests in __________.

简述蔡元培改革北大的教育实践。

43()

A. does
B. doesn’t
C. isn’t
D. is

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