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单项选择题
A．Pollution of coastal areas.B．Rise in sea levels.C．Exhaustion of sea resources.D．Earthquakes and volcanoes.
A．Pollution of coastal areas.
B．Rise in sea levels.
C．Exhaustion of sea resources.
D．Earthquakes and volcanoes.
单项选择题
A．They don’t have a positive attitude.B．They have other arrangements.C．They are too lazy.D．They get up too late.
A．They don’t have a positive attitude.
B．They have other arrangements.
C．They are too lazy.
D．They get up too late.
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