A. The runner who breaks the record B. The runner who covers the whole distance C. The runner who runs to keep fit D. The runner who doesn’t break the rules 参考答案:B
第16题: [单项选择]某小学一年级学生第一恒磨牙患龋率11.5%,最适宜的防龋措施是 A. 窝沟封闭 B. 含氟牙膏 C. 饮水加氟 D. 氟滴剂 E. ART 参考答案:A 答案解析:[解析] 全国第二次口腔流行病学调查显示,12岁儿童窝沟龋与平滑面龋的构成比分别为90.32%与9.68%,两者之比大约为9:1,说明我国儿童的窝沟龋预防十分重要。窝沟封闭是预防窝沟龋最有效的措施,6