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

相关考题

Some philosophers insist that one way to（）knowledge is ...

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

Until the final votes are cast, though, assurances（）for...

单项选择题Until the final votes are cast, though, assurances（）for nothing.

A．count
B．meant
C．give
D．account

All students have free（）to the library. A．passageway B．...

单项选择题All students have free（）to the library.

A．passageway
B．entrance
C．permission
D．access