单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．What a turbidity current is.
B．The causes of underwater earthquakes.
C．How winds can affect some ocean currents.
D．Why the book talks about turbidity currents.
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单项选择题
A．Soap.B．Grain.C．Steel.D．Tobacco.
A．Soap.
B．Grain.
C．Steel.
D．Tobacco.
单项选择题
A．He knows little about concepts of engineering.B．He can’t explain some concepts of engineering.C．He gives talks to high school students regularly.D．He doesn’t want the woman to postpone the talk.
A．He knows little about concepts of engineering.
B．He can’t explain some concepts of engineering.
C．He gives talks to high school students regularly.
D．He doesn’t want the woman to postpone the talk.
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