【单选题】【消耗次数：1】
We should make a clear ____ between the two scientific terms for the purpose of our discussion.
①
separation
②
discrimination
③
deviation
④
distinction
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相关题目
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①
portions
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fragments
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【单选题】
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critical
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①
give up
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①
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①
Source
②
sources
③
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①
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②
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③
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④
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①
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