单项选择题
乳牙期前牙反 牙合 的矫正年龄一般为
A 1-2岁
B 2-3岁
C 3-6岁
D 6岁以上
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The following are all cited as advantages of e-book EXCEPT______.A.imaginative designB.environmental friendlinessC.convenience for readersD.multimodal content
A.A.imaginative
B.environmental
C.convenience
D.multimodal
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判断题
改善旅游接待地原住民的生活质量是旅游业可持续发展的目标之一。 正确 错误
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