单项选择题
Questions 13 to 15 are based on the conversation you have just heard.
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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.
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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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单项选择题
A. The British government. B. George Washington.C. Ben Franklin. D. The private contractors.
A. The British government.
B. George Washington.
C. Ben Franklin.
D. The private contractors.
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