单项选择题

A．Chemicals.
B．Water.
C．Gas.
D．Vapor.
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单项选择题
A．Secretary and boss.B．Client and lawyer.C．Student and teacher.D．Patient and nurse.
A．Secretary and boss.
B．Client and lawyer.
C．Student and teacher.
D．Patient and nurse.
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.
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