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问题 单项选择题

5岁男孩右上乳中切牙冠折露髓2小时就诊。叩(+)，松动Ⅰ度。治疗方法是

A．直接盖髓
B．冠髓切断
C．根管治疗
D．干髓术
E．拔除

答案

参考答案：C

解析：乳牙冠折露髓，牙根已形成，应进行牙髓摘除术，尽量保留患牙。

完形填空

Section C （12分）

Directions: Complete the following passage by using ONE word that best fits the context.

When Mrs. Joseph Groeger died recently in Vienna, Austria, people asked, "Why did she live to be 107?".   48     were provided by a survey conducted among 148 Viennese men and women who had reached the age of 100. Somewhat surprising was the fact   49     the majority had lived most of their lives in cities.   50     the city's image as an unhealthy place, yet city living often provides benefits that country living can lack. One factor seems to be important to the longevity (长寿) of those interviewed.

This factor is exercise. In the cities it is often faster to walk short distances than   51   wait for a bus. Even taking public transportation often requires some walking. Smaller apartment houses have   52    elevators (电梯), and so people must climb stairs. City people can usually walk to local supermarkets.  53    parking spaces are hard to find, there is often no alternative to walking.

On the other hand, those who live in the   54     and suburbs do not have to walk every day. In fact, the opposite is often true. To go to school, work, or almost anywhere   55    , they must ride in cars.
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单项选择题

敏感性分析表的纵轴表示( )。

A．不确定因素变化率
B．内部实力强度
C．行业吸引力
D．项目效益指标
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