单项选择题
The troops have been on the（）for a possible enemy at tack.
A．alarm
B．alert
C．warning
D．notice
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单项选择题
Some philosophers insist that one way to（）knowledge is through an empirical approach.
A．disseminate
B．classify
C．test
D．acquire -
单项选择题
Until the final votes are cast, though, assurances（）for nothing.
A．count
B．meant
C．give
D．account -
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All students have free（）to the library.
A．passageway
B．entrance
C．permission
D．access
