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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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
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
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