单项选择题

A．It works on wet surfaces.
B．It’s stronger than synthetic glue.
C．It’s a nutritious source of protein.
D．It has been used successfully by doctors.
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单项选择题
A．A house which has been shut up for some period of time.B．An empty house that is usually kept clean.C．A comfortable house.D．A new house with fresh and clean smell.
A．A house which has been shut up for some period of time.
B．An empty house that is usually kept clean.
C．A comfortable house.
D．A new house with fresh and clean smell.
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