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
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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
单项选择题
There are a number of words in the English language which were French in ______.
A．invasion
B．origin
C．resource
D．phenomenon
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