【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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设二次函数<img src="20190730/1564474534244319.png" title="1564474534244319.png" alt="图片61.png"/>满足<img src="20190730/1564474542129883.png" title="1564474542129883.png" alt="图片62.png"/>，则<img src="20190730/1564474585302811.png" title="1564474585302811.png" alt="图片63.png"/>的值为（）
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②
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③
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