单项选择题

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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单项选择题
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.
单项选择题
A．He is very concerned about the North Korea’s nuclear program.B．He favors aggressive diplomacy to resolve the crisis.C．He thinks US troops should continue to join UN peace-keeping missions.D．He thinks large American units should not remain under US command.
A．He is very concerned about the North Korea’s nuclear program.
B．He favors aggressive diplomacy to resolve the crisis.
C．He thinks US troops should continue to join UN peace-keeping missions.
D．He thinks large American units should not remain under US command.
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