单项选择题

Questions 22～25 are based on the following monologue. What is the substance in cigarettes that causes cancer

A．Cigarette ashes.
B．Nicotine.
C．Tar.
D．Not mentioned here.
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单项选择题
A．searchingB．researchingC．studyingD．on working
A．searching
B．researching
C．studying
D．on working
单项选择题
Why does the man suggest that the woman read the book
A．The professor had written it.
B．It is the major text for the course.
C．It contains new sociological evidence.
D．The students from last year liked it.
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