单项选择题

A．A tour guide.
B．A shop assistant.
C．A cashier.
D．A waitress.
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单项选择题
A．It hurts our eyes.B．It is harmful to our respiratory system.C．It hurts our skin.D．It can cause cancers.
A．It hurts our eyes.
B．It is harmful to our respiratory system.
C．It hurts our skin.
D．It can cause cancers.
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