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
The first-year students at college normally ______ in age from 17 to 20 years old.
A．vary
B．differ
C．range
D．alternate
单项选择题
Eager to see these celebrities, she ______ accepted the invitation to the party.
A．reluctantly
B．readily
C．recklessly
D．radically
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