单项选择题

Though he was born and raised in America, he can speak______Chinese.

A．smooth
B．fluent
C．fluid
D．flowing
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单项选择题
Albert Einstein, the greatest scientist in the 20th century, once______an offer of $1,000 a minute to speak on the radio.
A．turned down
B．turned up
C．turned out
D．turned in
单项选择题
When you drive home, you can't be______ careful.
A．very
B．too
C．so
D．only
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