单项选择题

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

A．It is cleaner to use than ordinary ice
B．It takes longer time to melt
C．It is not so cold as ordinary ice
D．It is light and easy to carry
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单项选择题
A．By melting dry iceB．By turning ordinary ice into steamC．By passing steam over dry iceD．By mixing dry ice with ordinary ice
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
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.
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