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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Terrorists rarely give any warnings, so what counts is ______ and quick response.
A．postulations
B．precautions
C．promotions
D．presentations
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The first-year students at college normally ______ in age from 17 to 20 years old.
A．vary
B．differ
C．range
D．alternate
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