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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Animals' intelligence is determined by the size of the brain ______ the size of the body.
A．in response to
B．in proportion to
C．in regard to
D．in order to
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Eager to see these celebrities, she ______ accepted the invitation to the party.
A．reluctantly
B．readily
C．recklessly
D．radically
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