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.
参考答案C
解析:
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A．2,000.
B．4,000.
C．8,000.
D．16,000.
A．In order to celebrate its 100th anniversary this year.
B．In order to restore the spirit of the wounded city.
C．In order to raise more money.
D．In order to quicken the restoration step.
A．100.
B．53.
C．27.
D．54.