单项选择题

Terrorists rarely give any warnings, so what counts is ______ and quick response.

A．postulations
B．precautions
C．promotions
D．presentations
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单项选择题
To save some money, I had my former classmate ______ me ______ for a few nights.
A．put...up
B．take...up
C．pick...up
D．keep...up
单项选择题
The tunnels should be strengthened because of their ______ to an attack that could result in mass casualties.
A．punctuality
B．simuhaneity
C．vulnerability
D．reliability
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