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 them
C．a few of that
D．a few of which
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单项选择题
As we can no longer wait for the delivery of our order, we have to ______ it.
A．postpone
B．refuse
C．delay
D．cancel
单项选择题
Our country has ______ diplomatic relation with many countries in the world.
A．set
B．settled
C．fixed
D．established
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