单选题:在教“鸟”概念时.用麻雀、燕子说明“前肢为翼,无齿有喙”是“鸟”的本质特征,这是适当地运用了(  )。

题目内容:
在教“鸟”概念时.用麻雀、燕子说明“前肢为翼,无齿有喙”是“鸟”的本质特征,这是适当地运用了(  )。 A.产生式
B.注释
C.反例
D.正例
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