单项选择题

A) economic C) social
B) political D) artificial

A．economic
B．political
C．social
D．artificial
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单项选择题
A) us C) ourselvesB) our own D) our arts
A．us
B．our own
C．ourselves
D．our arts
单项选择题
A) would change C) changeB) are changed D) have changed
A．would change
B．are changed
C．change
D．have changed
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