单项选择题

A．They are never effective.
B．They are simple to perform.
C．They are not always very easy.
D．They are usually valid.
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单项选择题
A．Save money for a car.B．Buy a new car.C．Purchase a used car.D．Get a second car.
A．Save money for a car.
B．Buy a new car.
C．Purchase a used car.
D．Get a second car.
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Why is tourism a mixed blessing
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