单项选择题

Questions 19 to 21 are based on the passage you have just heard.

A. Keep it waterproof.
B. Keep it cool in summer.
C. Communicate with other birds of the same species.
D. Allow it to fly.
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单项选择题
A. He has never been to Gettysburg. B. He took a political science course. C. His family still goes on vacation together. D. He’s interested in the United States Civil War.
A. He has never been to Gettysburg.
B. He took a political science course.
C. His family still goes on vacation together.
D. He’s interested in the United States Civil War.
单项选择题
A. Why the book talks about turbidity currents. B. How winds can affect some ocean currents. C. The causes of underwater earthquakes. D. What a turbidity current is.
A. Why the book talks about turbidity currents.
B. How winds can affect some ocean currents.
C. The causes of underwater earthquakes.
D. What a turbidity current is.
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