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.
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单项选择题
A．They made them by knives.B．They found adequate stones.C．They used bones of animals.D．They made tools by hitting stone against stone.
A．They made them by knives.
B．They found adequate stones.
C．They used bones of animals.
D．They made tools by hitting stone against stone.
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.
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