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【参考答案】

occured→occurred
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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．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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