单项选择题

You are advised to take traveler's checks, which provide a secure _________to carrying your money in cash.

A．preference
B．selection
C．substitute
D．alternative
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单项选择题
The missing man was found _________and unconscious in the back of a truck.
A．fixed
B．fastened
C．wrapped
D．bound
单项选择题
What are the _________ that distinguish the Chinese from the Japanese
A．marks
B．signs
C．characteristics
D．features
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