问题
单项选择题
近年龋病下降最主要的原因是（）
A.氟化饮水
B.含氟涂料
C.含氟牙膏
D.氟化泡沫
E.含氟凝胶
答案
参考答案：C
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近年龋病下降最主要的原因是（）
A.氟化饮水
B.含氟涂料
C.含氟牙膏
D.氟化泡沫
E.含氟凝胶
参考答案：C
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| In Mr. Allen's high school class, all the students have to "get married". 1 , the wedding ceremonies (婚礼) sometimes become so 2 that the loud laughter drowns out the 3 of the"minister (牧师)". 4 the two students getting married often begin to 5 . The teacher, Mr. Allen, believes that marriage is a difficult and serious 6 . He wants young people to understand that there are many changes that must take place 7 marriage. He believes that the need for these changes 8 be understood before people marry. Mr. Allen doesn't only introduce his students to 9 problems in marriage such as illness or being out of work. He also exposes 10 to the difficult and particular problems they will 11 every day. He even familiarizes his students 12 the problems of divorce (离婚). It has been 13 for some of the students to see the problems that a married 14 often faces. 15 they took the course (课程), they had not worried 16 about the problems of marriage. However, both 17 and parents feel that Mr. Allen's course is valuable and have 18 it publicly. Their statements and letters 19 the class have asked the school to 20 the course again. | ||||
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