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【参考答案】

E：critical。
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单项选择题
A．There is a flood every two years.B．The flood is the worst ever since fifties.C．There is a serious drought.D．There is a severe flood.
A．There is a flood every two years.
B．The flood is the worst ever since fifties.
C．There is a serious drought.
D．There is a severe flood.
单项选择题
A．Study a weather map.B．Visit a weather station.C．Watch a weather report.D．Go to a storm shelter.
A．Study a weather map.
B．Visit a weather station.
C．Watch a weather report.
D．Go to a storm shelter.
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