单项选择题

A．To make an appointment.
B．To ask for an interview.
C．To have a negotiation.
D．To promote advertisement.
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单项选择题
A．In the countryside.B．At the top of a hill.C．By a river.D．On a grassland.
A．In the countryside.
B．At the top of a hill.
C．By a river.
D．On a grassland.
单项选择题
A．Chemicals.B．Water.C．Gas.D．Vapor.
A．Chemicals.
B．Water.
C．Gas.
D．Vapor.
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