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Sensitive teeth may indicate a serious problem that may need prompt care by a dentist.
【参考答案】
Y
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r n r n 年份 r n 人数 r n r n r n 2002 r n 27 r n r n r n 2004 r n 68 r n r n r n 2005 r n 116 r n r n r n 2006 r n 130 r n r n上表描述的是几年来内地大学生自杀人数 2.分析其中的原因 3.怎么尽量避免惨剧的发生 Suicide on Campus
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Receding gums is often the result of hard tooth brushing.
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