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
单项选择题
A．People evacuated from their homes can return now.B．Flood waters are receding in all parts of the upper mid-western United States.C．Flooding is expected to continue for a few more days.D．There was a record snowfall last year.
A．People evacuated from their homes can return now.
B．Flood waters are receding in all parts of the upper mid-western United States.
C．Flooding is expected to continue for a few more days.
D．There was a record snowfall last year.
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