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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
33%
的考友选择了B选项
52%
的考友选择了C选项
2%
的考友选择了D选项
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