单项选择题

The mother warned her little boy not to ______ on the floor, which should be kept smooth.

A．scratch
B．grasp
C．desert
D．absorb
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单项选择题
The ______ teeth, which are not easily fallen off, come in after the baby teeth.
A．lasting
B．permanent
C．durable
D．enduring
单项选择题
I can't ______ what has happened to the vegetables, for they were freshly picked this morning.
A．figure out
B．draw out
C．look out
D．work out
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