单项选择题

A．On television.
B．At registration.
C．In class.
D．At work.
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单项选择题
A．They were drawing pictures.B．They were watching TV.C．They were making a telephone call.D．They were tidying up the drawing room.
A．They were drawing pictures.
B．They were watching TV.
C．They were making a telephone call.
D．They were tidying up the drawing room.
单项选择题
A．Through food.B．Through air.C．Through insects.D．Though body fluids.
A．Through food.
B．Through air.
C．Through insects.
D．Though body fluids.
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