单项选择题

The purpose of the advertisement is to ______.

A. promote a special flight program
B. recommend long distance flights

C. introduce different airlines
D. describe an alliance flight
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单项选择题
The advantage of the alliance lies in ______.
A. its detailed travel information
B. its unique booking system

C. its longest business flights
D. its global service network
单项选择题
The students didn't do ______ the professor showed them to do.
A. as if
B. as
C. after
D. although
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