单项选择题

The heart is an important organ of circulation ______ function is to pump blood to all parts of the body.

A．which
B．whose
C．of it
D．its
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单项选择题
In spite of what we said, be refused to ______ to the police station.
A．give away
B．give off
C．give himself away
D．give himself up
单项选择题
______ with the size of the whole earth, the highest mountain does not seem high at all.
A．When compared
B．Compare
C．While comparing
D．Comparing
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