单项选择题

Very few people understood her lecture, the subject of ______ was very obscure.

A．what
B．that
C．which
D．it
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单项选择题
A completely new situation will ______ when the examination system comes into existence.
A．arise
B．rise
C．raise
D．arouse
单项选择题
Scientists are seeking ways to ______ cancer.
A．conquer
B．defeat
C．overcome
D．subdue
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