单项选择题

Questions 22～25 are based on the following monologue on smoking. Which substance in cigarette causes cancer

A．Cigarette ashes.
B．Nicotine.
C．Tar.
D．Not mentioned here.
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单项选择题
Where are the two speakers
A．In a hotel.
B．At a dinner table.
C．In the street.
D．At the man’s house.
单项选择题
Which material should the house be built of
A．Stone.
B．Brick.
C．Cement.
D．Wood.
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