单项选择题

A．Going after a mouse.
B．Always using voices.
C．Purring when they are happy.
D．Arching their backs when they are afraid.
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单项选择题
A．In an insurance company.B．At the railway station.C．At the post office.D．At the customs.
A．In an insurance company.
B．At the railway station.
C．At the post office.
D．At the customs.
单项选择题
A．People.B．Environment.C．Reality.D．Life.
A．People.
B．Environment.
C．Reality.
D．Life.
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