How did African people send messages?-考呗网题库移动版

单选题 How did African people send messages?

A．In a special way.
B．Over a very short distance.
C．By a musical instrument.
D．At a rather slow speed.

参考答案C

解析:

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单选题 According to the passage, the telephone was invented in

A．France.
B．Rome.
C．Africa.
D．America.

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单选题If an object weighed one pound on the surface of the earth, how much would it weigh 4,000 miles above the earth?

A．3/4 pounds.
B．4 pounds.
C．1/9 pound.
D．1/4 pounds.

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单选题 We feel an object is heavy

A．because weight is a fixed quality in an object.
B．because they are far away from the centre of the earth.
C．because of the earth's strong attraction for them.
D．because they are not taken away from the surface of the earth.

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