问题
单项选择题
女，30岁。右上第一前磨牙全冠粘固后发生龈缘炎，其可能的原因，除了（）
A.冠边缘过长
B.冠边缘不密合
C.轴壁凸度不良
D.龈沟内粘固剂残留
E.咬合早接触
答案
参考答案：E
解析：全冠粘固后发生龈缘炎的原因有：修复体轴壁突度不良；冠边缘过长、边缘抛光不良、悬突；试冠、戴冠时对牙龈损伤；嵌塞食物压；倾斜牙、异位牙修复体未能恢复正常排列和外形。
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女，30岁。右上第一前磨牙全冠粘固后发生龈缘炎，其可能的原因，除了（）
A.冠边缘过长
B.冠边缘不密合
C.轴壁凸度不良
D.龈沟内粘固剂残留
E.咬合早接触
参考答案：E
解析：全冠粘固后发生龈缘炎的原因有：修复体轴壁突度不良；冠边缘过长、边缘抛光不良、悬突；试冠、戴冠时对牙龈损伤；嵌塞食物压；倾斜牙、异位牙修复体未能恢复正常排列和外形。
| 阅读理解。 | |
| 根据短文内容,从下框的A～F选项中选出能概括每一段主题的最佳选项。选项中有一 项为多余选项
1. China has to transform from an "economic power" to a "livable power" in order to keep its wealth, talent and confidence. The "2011 China Private Wealth Report" released recently by China Merchants Bank, shows that nearly 60 percent of the respondents(调查对象) whose investment exceed(超越) 10 million yuan have plans to emigrate by investing. 2. Human migration is not a new phenomenon. From the Euro-Asian Silk Road to Columbus's Discovery of the New World, migrants have brought about cultural communications and economic exchanges across the world. Migration has become an important driving force for social progress. 3. Nowadays, economic globalization has considerably improved the freedom and increased the attractiveness of migration from one country to another. A certain degree of Chinese emigration can not only offer more opportunities in personal life, employment and investment but also boost(促进) the exchange and cooperation between China and other countries. 4. However, the factors of emigration wave should also be figured out. The topic of emigration seems serious because this new wave has to some extent reflected some "unlivable" factors in China. The reasons provided by Chinese emigrants include helping their children to avoid domestic exam-oriented education, obtaining a healthy living environment and sound social security, seeking a sounder investment environment and getting rid of the "anti-rich" atmosphere arising from the inequality in wealth. 5. In order to curb(控制) the wave of emigration, China should further deepen social and economic reforms, improve its educational system to guarantee children's health and happiness, as well as strengthen the protection of private wealth through legislation(立法). Furthermore, China should also improve the social security system to increase people's happiness, crack down on corruption and promote social justice and equity so as to uphold the dignity of ordinary citizens. Only in this way can China retain its wealth, talent and confidence and curb the overheated immigration wave. |