单项选择题

A) essential C) excellent
B) unusual D) critical

A．essential
B．unusual
C．excellent
D．critical
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单项选择题
A) economic C) socialB) political D) artificial
A．economic
B．political
C．social
D．artificial
单项选择题
A) us C) ourselvesB) our own D) our arts
A．us
B．our own
C．ourselves
D．our arts
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