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.
填空题
consciousness
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