单项选择题

Passage Three Questions 17 to 20 are based on the passage you have just heard.

A．By melting dry ice
B．By turning ordinary ice into steam
C．By passing steam over dry ice
D．By mixing dry ice with ordinary ice
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单项选择题
Which institution first taught medicine in colonial America
A．The University of Pennsylvania.
B．University of London
C．King’s College
D．Columbia University.
问答题
After watching scores of people shop for food day in day out, I have become somewhat of an expert on the habits of American consumers.
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