单项选择题

Though Jane was offended by her sister's rude remarks, she only ______ her lips and said nothing.

A．compress
B．condense
C．contract
D．constrict
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单项选择题
You have to be ______ when you try to work out mathematical formulas.
A．reasonable
B．rational
C．logical
D．sound
单项选择题
The White House and other federal buildings were ______ as a plane enters the restricted airspace.
A．vacated
B．empty
C．deserted
D．evacuated
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