单项选择题

How often does this event probably take place

A. Every month
B. Every three months
C. Every six months
D. Every year
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单项选择题
Who is the talk for
A. Visiting students
B. Business clients
C. New workers
D. Safety inspectors
单项选择题
What is the report mainly about
A. Canceled airline flights
B. A new domestic airport
C. A new airport shuttle bus
D. A new transportation service
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