问题
单项选择题
可摘局部义齿后牙区人工牙脱落最常见的原因是（）
A．深覆
，咬合紧
B．龈距离低
C．塑料人工牙盖嵴部位未磨粗糙或者被污染
D．铸件设计制作有缺陷
E．义齿基托范围大
答案
参考答案：C
搜题请搜索小程序“爱下问搜题”
可摘局部义齿后牙区人工牙脱落最常见的原因是（）
A．深覆，咬合紧
B．龈距离低
C．塑料人工牙盖嵴部位未磨粗糙或者被污染
D．铸件设计制作有缺陷
E．义齿基托范围大
参考答案：C
完形填空 (共15小题；每小题l分，计15分) Everybody wants a new start for a new school year. So, students often go back-to-school shopping. They buy___1___and shoes. But, the story is not so easy. "Mum, I want this pair of shoes!" "Dear! Those are 900 yuan! That is too __2___ !" "But all the boys in my class wear this brand (牌子)!" So the real story is: Kids___3____to catch up with school fashion. Chinese students __4___ uniforms at school. Parents think all the kids look the same, but _5___ know the differences. The "rich" kids wear amazing watches, ride good __6___ and use cool pencil cases. They show off their expensive things to __7__ kids. Then everyone else wants them too. For example, some "rich" kids use a pencil box that __8___1,000 yuan! It not only holds pencils, but also has a thermometer (温度计), a compass (指南针), a music box and even games in it! But think about it. Do you really need ____9___ a special pencil box? What can you do with a compass ___10____a thermometer in class? They only distract (分散注意) you. As for these "rich" kids, they are not rich at all. __11___ parents buy them all their cool things. They may have an advantage（优势）now, ____12___ it won't last forever. If you want to show off ___13___ money you have, you have to make it yourself first. So, study hard. You will get a great job in the future. Parents should also learn __14____to refuse (拒绝) their kids' demands (要求). They should __15__their kids: as students, what is really important is not school fashion but good school grades.
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