单项选择题

A．About 3500
B．
C．B. Long before history was written.C. When there was history record.
D．About 4500B.
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单项选择题
A．Self-conscious.B．Talkative.C．Easy-going.D．Hostil
A．Self-conscious.
B．Talkative.
C．Easy-going.
D．Hostil
单项选择题
A．United States-Canadian agreements.B．Unlimited growth in population.C．Pollution in the Great Lakes.D．The limited supply of phosphates.
A．United States-Canadian agreements.
B．Unlimited growth in population.
C．Pollution in the Great Lakes.
D．The limited supply of phosphates.
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