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
<上一题 目录 下一题>
热门 试题

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.
单项选择题
How does the writer feel about Prof. Birdwhistell’s conclusion
A．He is very surprised but believes it.
B．He is quite worried about it
C．He is rather doubtful about it.
D．He is puzzled about it.
相关试题