问题
单项选择题
楔状缺损的病因不包括（）。
A.不恰当的刷牙方法
B.酸的作用
C.食物嵌塞
D.牙颈部结构薄弱
E.应力疲劳
答案
参考答案：C
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楔状缺损的病因不包括（）。
A.不恰当的刷牙方法
B.酸的作用
C.食物嵌塞
D.牙颈部结构薄弱
E.应力疲劳
参考答案：C
The “Doorman” On a trip to California, my family stopped for lunch. As we walked toward the entrance to the restaurant, a man, with a 36 beard and dirty hair, jumped up from a bench and opened the door for us．Regardless of his 37 , he greeted us in a friendly way． Once inside, my daughters whispered, "Mom, he 38 " After we ordered our lunch, I explained, telling the kids to look 39 the dirt．We then watched other customers approach the restaurant but many 40 him．Seeing this rudeness truly upset me．The day I became a mother, I had decided to set a good 41 for my children．Yet sometimes when things didn't go right, being a good example was 42 When our meal arrived, I realized I had left the car-sick pills in the truck．With the windiest trip ahead, the kids needed them, so I 43 myself from the meal and went to get them． Just then, the "doorman" was opening the door for a couple．They rushed past him without even acknowledging his 44 . Letting them in first, I said a loud "thank you" to him as I 45 ． When I returned, we talked a bit．He said he was not allowed inside 46 he purchased food．I went back and told my family his 47 . Then I asked our waitress to add one soup and sandwich．The kids looked 48 as we had already eaten, but when I said the order was for the "doorman" , they smiled．When it was time to 49 our trip, I noticed the "doorman" enjoying his meal．Upon seeing me, he stood up and thanked me heartily．He then 50 his hand for a handshake and I gratefully accepted．I suddenly noticed the tears in his eyes—tears of 51 . What happened next drew great astonishment: I gave the " doorman" a 52 ! He pulled away, with tears 53 down his face． Back in truck, I fell into deep thought．While we can't choose many things in life, we can choose when to show gratitude．I said thanks to a man who had 54 held open a door for me, and also said thanks for that 55 to teach my children by example．
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