单项选择题

Unless ______ by credit card, please pay in cash.

A．pay
B．is paid
C．paying
D．paid
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单项选择题
Good travelers don't leave ______ on trains or airplanes.
A．rubbish
B．litter
C．garbage
D．pollutant
单项选择题
His body temperature has been ______ for 3 days, the highest point reaching 40.5 degree centigrade.
A．uncommon
B．disordered
C．abnormal
D．extraordinary
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