单项选择题

Psychologists have succeeded in ______ parents' confidence in their own authority.

A．underrating
B．undervaluing
C．underplaying
D．undermining
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单项选择题
The streets are ______ with people.
A．live
B．lively
C．living
D．alive
单项选择题
In less than a millionth of a second the vast computer of an international airline can ______ accept 800 booking inquiries, and search its 50 million memory units for appropriate replies.
A．simultaneously
B．implicitly
C．cautiously
D．confidentially
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