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
She ______ for a while and was unable to make a decision, so she asked for my help.
A．flickered
B．glittered
C．faltered
D．blinked
单项选择题
It is not enough to observe behavior and ______ them with physiological events that occur at the same time.
A．correlate.
B．comply
C．correspond
D．pertain
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