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【单选题】

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

B．appearance
C．outer
D．hiding
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根据网考网移动考试中心的统计，该试题：

13%的考友选择了A选项

13%的考友选择了B选项

70%的考友选择了C选项

4%的考友选择了D选项

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