单项选择题

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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.
单项选择题
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.
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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