单项选择题

A．By selling coal and other natural products.
B．By selling services that make life comfortable.
C．By selling land containing oil.
D．By selling public land.
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单项选择题
A．Because they have a driving license.B．Because they have received special training.C．Because the traffic conditions in London are good.D．Because the traffic system of the city is not very complex.
A．Because they have a driving license.
B．Because they have received special training.
C．Because the traffic conditions in London are good.
D．Because the traffic system of the city is not very complex.
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