20,50 years.,50,100 years.,100,120 years.,200,500 years-找考题网

单项选择题

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

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单项选择题

A．Blowing.B．Splitting atoms.C．Joining atoms.D．None of the abov

A．Blowing.
B．Splitting atoms.
C．Joining atoms.
D．None of the abov

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