单项选择题

New ideas sometimes have to wait for years ______ they are fully accepted.

A．when
B．before
C．after
D．where
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单项选择题
If I take this medicine three times a day, it should ______ my cold.
A．heal
B．cure
C．treat
D．recover
单项选择题
His speech rambled for half an hour, but the ______ of what he had said was that too many people has too little money.
A．aim
B．purpose
C．essence
D．content
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