单项选择题

A．The woman is going out to lunch.
B．The woman wants to eat some chocolate.
C．The woman will go to a convenience store.
D． The woman will be back in 30 minutes.
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单项选择题
A．In San FranciscoB．At an airport. C． At a travel agencyD．In a post office.
A．In San Francisco
B．At an airport.
C． At a travel agency
D．In a post office.
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
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