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
What did the man ask the woman to do
A．Go on a diet.
B．Have a snack.
C．Play some tennis.
D．Stop screaming.
单项选择题
Marie could hardly recognize the office she went into as ______.
A．she had been there only once
B．Mr. Smith was not in the office
C．nobody was doing any work
D．the office had a new appearance
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