问题 单项选择题 A1型题

多用于远中孤立的磨牙上,上颌磨牙向近中颊侧倾斜、下颌磨牙向近中舌侧倾斜者的卡环是()。

A.回力卡环

B.延伸卡环

C.三臂卡环

D.圈形卡环

E.对半卡环

答案

参考答案:D

解析:回力卡环常用于后牙游离端缺失,基牙为前磨牙或尖牙,牙冠较短或呈锥形;延伸卡环用于基牙松动或基牙外形圆凸无倒凹无法获得足够固位力者;三臂卡环多用于位置较为正常的健康基牙;圈形卡环多用于最后孤立的磨牙上,牙向近中舌侧(多为下颌)或近中颊侧(多为上颌)倾斜;对半卡环主要用于前后有缺隙、孤立的前磨牙或者磨牙。故选D。

阅读理解

根据短文内容, 从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Ten years ago, I used to be very fit. __小题1:__ I used to play tennis a lot and go for long walks. In those days, I didn’t earn very much. I had a job in an office. It wasn’t a very good job but I had a lot of time to do the things I enjoyed doing.

__小题2:__ The pay was better, but the hours were a lot longer. I bought a car and drove to work every day. I began to take people out to lunch. And I began to put on weight, too. I stopped playing tennis and going for long walks at weekends because I just didn’t have any time for things like that any more.

There’s a lot of stress (压力) in my job. Perhaps that’s why I started drinking more than I used to. For example, I used to have only half a glass of whisky when I got home, but then I started filling my glass to the top. Then I had another glass, and then another. __ 小题3:__ I never used to smoke at all.

Two months ago, I had a heart attack. At first I just couldn’t believe it. “I’m too young.” I said.  Luckily it wasn’t very serious. I was in hospital a few days and they did a lot of tests. __小题4:__ He also advised me to work less and get more exercise. But I just haven’t any time! __小题5:__

Sometimes I wonder if I should get another job. Perhaps I could do something like I used to do. But if I do that, I won’t earn as much. I have a family to support. I have to think of them, too. I just don’t know what I should do. What do you think?

A.Then, about eight years ago, I got a much better job.

B.My job takes everything out of me!

C.I rode a bike to work and I got a lot of exercise at weekends.

D.Drinking became part of my life.E. I started smoking a lot, too.

F. Ten years later, I lost my first job.

G. The doctor advised me to stop smoking and to eat less.

单项选择题