The hard, out surface of the tooth is called enamel.A、outsideB、appearanceC、out

游客2023-12-27 46

问题 The hard, out surface of the tooth is called enamel.

选项 A、outside
B、appearance
C、outer
D、hiding

答案 C

解析本题考查形容词的用法。句意为：牙齿坚硬的外层称为牙釉质。所以，此处徐填入表示“外面的”之意的词语。outside和outer均有“外部的”之意。outside一般指物体的外表或表面；而outer指相对于内部而言的外部或外表；appearance意为“外貌，外观”：hiding意为“隐匿”。所以，答案为C。

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