单项选择题

A．In San Francisco
B．At an airport.
C． At a travel agency
D．In a post office.
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单项选择题
How many revolutions must the largest cog make in order to bring the cogs back to their original positions
A．56
B．48
C．36
D．12
单项选择题
BONA FIDE is to genuine as DE FACTO is to________.
A． together
B．actual
C． reason
D．assumed
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