单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．Computer sales negotiations.
B．A preliminary interview.
C．An Internet seminar meeting.
D．Computer games.
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单项选择题
According to World Health Organization, how many people am killed by outdoor air pollution
A．3 million
B．2.1 million
C．1.6 million
D．3.2 million
单项选择题
A．$80.B．$60.C．$90.D．$15.
A．$80.
B．$60.
C．$90.
D．$15.
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