单项选择题

Living in poverty, John sold for 500 dollars the _______ of his mother's first work which made her famous.

A．document
B．file
C．duplicate
D．manuscript
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单项选择题
As ordinary people, scientists are by no means more honest or _______ than other people, but as scientist, they attach special value to honest while they are in their working sphere.
A．ethical
B．ethnic
C．aesthetic
D．esthetic
单项选择题
Asian economic crisis has only a _______ effect on the lives of Chinese people.
A．discrete
B．massive
C．marginal
D．subordinate
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