单项选择题


Conversation 2

A．Water and electricity.
B．Raw materials.
C．Transportation expenses.
D．Time and space.
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单项选择题
A．In a restaurant.B．In a hotel.C．In a department store.D．In an office.
A．In a restaurant.
B．In a hotel.
C．In a department store.
D．In an office.
单项选择题
A．By a central control system.B．By several separated computers.C．By a mechanical ann.D．By a few people.
A．By a central control system.
B．By several separated computers.
C．By a mechanical ann.
D．By a few people.
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