单项选择题

A．By raising cattle.
B．By working on farms.
C．By working in factories.
D．By raising sheep.
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单项选择题
A．The soil has been overworked.B．The climate is cold.C．The weather is too dry.D．The soil is sandy.
A．The soil has been overworked.
B．The climate is cold.
C．The weather is too dry.
D．The soil is sandy.
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