单项选择题

The American Red Cross is one of the volunteer organizations ______ purpose is to help the sick and the needy.

A．its
B．that
C．who
D．whose
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单项选择题
It is natural that one's attitude ______ his family changes as he grows older.
A．for
B．at
C．of
D．towards
单项选择题
Very little ______ they had made an important discovery in science.
A．they realized
B．they realized what
C．did they realize
D．did they realize what
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