单项选择题

A．Artists.
B．Tour guides
C．Grocers.
D．Musicians.
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单项选择题
A．Litter.B．Water pollution.C．Air pollution.D．Noise pollution.
A．Litter.
B．Water pollution.
C．Air pollution.
D．Noise pollution.
单项选择题
A．Family members.B．Relatives.C．Colleagues.D．Classmates.
A．Family members.
B．Relatives.
C．Colleagues.
D．Classmates.
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