单项选择题

A．To explain the effects of turbidity currents.
B．To explain how winds cause turbidity currents.
C．To remind the student about the next assignment.
D．To remind the student where ocean sediments originate.
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A．Your eyesight.B．Your driving ability.C．The mechanical condition of your car.D．Your knowledge of traffic regulations.
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A．They live in bigger houses.B．They live in villages or in towns.C．Each family lives on its own fields.D．They use modern machines in farming.
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