单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A．Buenos Airs.
B．New York.
C．San Francisco.
D．New Orleans.
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单项选择题
A．A controlled study.B．A trial study.C．An observational study.D．A successful study.
A．A controlled study.
B．A trial study.
C．An observational study.
D．A successful study.
单项选择题
A．Work in this area is easy and relaxing.B．There are too many criminals and the work is challenging.C．The job is challenging and the pay is high.D．It is easy for him to find job after graduation.
A．Work in this area is easy and relaxing.
B．There are too many criminals and the work is challenging.
C．The job is challenging and the pay is high.
D．It is easy for him to find job after graduation.
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