单项选择题

Small children can not ______ the difference between right and wrong. It is our duty to teach them.

A．appreciate
B．enjoy
C．acknowledge
D．confess
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单项选择题
If you plant two apple trees in one square yard of land, and the trees' productivity ______ decline.
A．is bound to
B．is determined to
C．is unlikely to
D．is related to
单项选择题
Usually he managed to find plenty of work to ______ him over hard times, I think it is a good ide
A．A. chewB. blowC. flipD. tide
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