单项选择题

Water enters into a great variety of chemical reactions, ______ have been mentioned in previous pages.

A．a few of it
B．a few of that
C．a few of them
D．a few of which
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单项选择题
The survey found that Hungary ______ as the most environment-conscious country of East Europe.
A．broke out
B．held out
C．ran out
D．stood out
单项选择题
Prof. Lee's book will show you ______ can be used in other contexts.
A．that you have observed
B．that how you have observed
C．how that you have observed
D．how what you have observed
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