单项选择题

A．Self-conscious.
B．Talkative.
C．Easy-going.
D．Hostil
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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.
单项选择题
A．loweringB．bringing downC．keeping upD．pushing up
A．lowering
B．bringing down
C．keeping up
D．pushing up
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