单项选择题

Some educators try to put students of similar abilities into the same class because they believe this kind of ______ grouping is advisable.

A．homogenous
B．instantaneous
C．spontaneous
D．anonymous
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单项选择题
They had planned to go outing this weekend, but they finally had to ______ it because of the rainy weather.
A．cancel
B．eliminate
C．delay
D．prolong
单项选择题
A man has to make______ for his old age by putting aside enough to live on when old.
A．supply
B．assurance
C．provision
D．adjustment
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