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．homogeneous
B．instantaneous
C．spontaneous
D．anonymous
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单项选择题
in the meantime, the question facing the business is whether such research is ______ the costs.
A．worth
B．worth of
C．worthy
D．worthwhile
单项选择题
Seeing a snake ______ on the ground, the baby cried into tear.
A．gliding
B．skidding
C．slipping
D．prancing
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