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．The life of farmers in America in general.B．The effect of modern ideas on the life on farms.C．The education received by children of American farmers.D．The difference between farmers’ life in the USA and that in other countries.
A．The life of farmers in America in general.
B．The effect of modern ideas on the life on farms.
C．The education received by children of American farmers.
D．The difference between farmers’ life in the USA and that in other countries.
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