单项选择题

A．A hotel.
B．A supermarket.
C．A city store.
D．A fast food restaurant.
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单项选择题
A．Whether second hand smoking is liked with cancer.B．Whether active smoking is linked with cancer.C．Whether passive smoking by children is liked with childhood cancers.D．Whether an average degree of passive smoking is harmful.
A．Whether second hand smoking is liked with cancer.
B．Whether active smoking is linked with cancer.
C．Whether passive smoking by children is liked with childhood cancers.
D．Whether an average degree of passive smoking is harmful.
单项选择题
A．36 weeks.B．4 weeks.C．3 weeks.D．5 weeks.
A．36 weeks.
B．4 weeks.
C．3 weeks.
D．5 weeks.
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