单项选择题

Questions 9 to 12 are based on the conversation you have just heard.

A. To explain how winds cause turbidity currents.
B. To remind the student where ocean sediments originate.
C. To explain the effects of turbidity currents.
D. To remind the student about the next assignment.
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单项选择题
A. Because the horse and wagon were slow. B. Because the trains were too fast. C. Because some towns were far away. D. Because the communities didn’t like it.
A. Because the horse and wagon were slow.
B. Because the trains were too fast.
C. Because some towns were far away.
D. Because the communities didn’t like it.
填空题
motivations
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