患者诉右下后牙食物嵌塞，临床：右下78间食物嵌塞，8正位且无对颌牙，请分析最可能的原因是（）
A.外溢道消失
B.对颌牙牙尖过于高陡
C.两牙边缘嵴高度不一致
D.上颌牙伸长
E.牙间 * * 退缩
参考答案：C
解析：题干中信息：右下78间食物嵌塞，8正位且无对颌牙。由此可怀疑8无对颌牙后伸长，与7远中边缘嵴高度不一致，引起食物嵌塞。其余选项题干中并无相关信息。
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| I live in Albuquerque, New Mexico. I used to give a lot of money to the homeless,feeling 1 for them. But as time passed, I became a mom with no home, a huge 2 , and hardly any income. As a result, I 3 giving money to the people on the side of the road and became very 4 . Things started to change for me 5 . I had a home, a backyard for my daughter,and plenty of food, and I started to 6 myself out of debt. One day we saw a homeless person with the 7 , "Will work for food." I 8 . My daughter commented. "Mommy, you used to always give money to those people in 9 ." I replied, "Honey, they just use that money for 10 , or other bad things." She didn't respond. 11 when I said that, I didn't feel right. Three days later, I was driving to 12 my daughter from school. A man was standing on the corner, and something deep 13 me said,"Just help the guy." So I 14 down my window, and he ran over excitedly. He said,"God bless you, I only need 77 cents." I 15 into my ashtray (烟灰缸) and strangely enough, there 16 three quarters and two pennies. I picked them up and gave them to him. He 17 with joy and tears in his eyes."Wow, you just made it 18 for me to see my mom for Christmas! Thank you so much; the 19 that had this great sale is leaving in 20 minutes!" It was a moment I'll 20 forever. I think that man won't forget it either, but I was the one who got the best gift in life-GIVING. | ||||
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