2. 外语
  3. Enamel, the hardest substance in a human being’s body, covers the entire crown of the tooth.

Enamel, the hardest substance in a human being’s body, covers the entire crown of the tooth.

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问题 Enamel, the hardest substance in a human being’s body, covers the entire crown of the tooth.
选项 A、whole
B、inseparable
C、superficial
D、main
答案A
解析
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