单项选择题
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A.To find out how clever monkeys were.
B.To test the intelligence of different animals.
C.To tell the difference between man and the monkey.
D.To find out how monkeys search for food.
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单项选择题
A.It should be made of metal.B.It should be durable, distinct, divisible and portable.C.It had been 2,000 years old.D.It should be made of high-quality materials.
A.It should be made of metal.
B.It should be durable, distinct, divisible and portable.
C.It had been 2,000 years old.
D.It should be made of high-quality materials.
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单项选择题
A.Strip-cities.B.Transportation of the future.C.Energy conservation.D.Advantages of air transportation over railroads.
A.Strip-cities.
B.Transportation of the future.
C.Energy conservation.
D.Advantages of air transportation over railroads.
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