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Words like nylon， orlon. rayon are words from proper names， which were originally（）.
Words like nylon， orlon. rayon are words from proper names， which were originally（）.
A、names ofpeople
B、names ofplaces
C、names of books
D、tradenames
正确答案：D
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The prefixes bi-， multi-， semi- are（）prefixes.
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（）is the result of human recognition， reflecting the objective world in the human mind.