单项选择题


A．alternated
B．modified
C．refined
D．deleted
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单项选择题
A．constructiveB．negativeC．destructiveD．inactive
A．constructive
B．negative
C．destructive
D．inactive
单项选择题
A．existedB．discoveredC．createdD．manufactured
A．existed
B．discovered
C．created
D．manufactured
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