单项选择题

A．Greenhouse gases.
B．Over-exploitation of the beach.
C．Change of agricultural zones.
D．Change of climates.
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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.
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.
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