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.
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单项选择题
A．He is working hard all the time.B．He is lazy all the time.C．He works hard so as to get his three meals.D．He often has his three meals on tim
A．He is working hard all the time.
B．He is lazy all the time.
C．He works hard so as to get his three meals.
D．He often has his three meals on tim
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
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