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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Training astronauts- ______ not an easy thing.
A．are
B．is
C．were
D．be
单项选择题
I invited Tom and Ann to dinner, but ______ of them came.
A．both
B．none
C．either
D．neither
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