2. 外语
  3. In 2004, Professor Baughman invented a super-strong, super-light magic material and he named it "mithril" — after the precious a

In 2004, Professor Baughman invented a super-strong, super-light magic material and he named it "mithril" — after the precious a

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问题 In 2004, Professor Baughman invented a super-strong, super-light magic material and he named it "mithril" — after the precious armor in the popular filmThe Lord of Rings.
The artificial joint with ______ , being a good imitation of natural bone protein, can attract bone cells and become quickly incorporated into the body.
选项
答案a nanotube coating
解析 参见最后一段：...Fenniri has made a nanotube coating for the artificial joint． It’s a very good imitation Of collagen，a natural protein that is part of bone．As a result，the coating attracts bone cells．This is important because bone growth helps integrate an artificial joint into the body
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