A．should be banned in order to save energyB．brings some-找考题网

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A．should be banned in order to save energy
B．brings some side effects
C．causes the earth’s temperature rise
D．should not be blamed for the pollution of environment

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first-name basis

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A．20--50 years.B．50--100 years.C．100--120 years.D．200--500 years.

A．20--50 years.
B．50--100 years.
C．100--120 years.
D．200--500 years.

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