单项选择题

Questions 22 to 25 are based on the passage you have just heard.

A. The postal service failed.
B. The postal service has developed a system.
C. it remained the same.
D. The postal service has developed all over the country.
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单项选择题
B
单项选择题
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.
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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