问题 单项选择题

患者,缺失,设计双端固定桥时,对于固定连接体的要求正确的是()

A.位于基牙的非接触区

B.面积不能小于4mm2

C.面积不能大于4mm2

D.不必形成正常的唇颊、舌外展隙

E.应当占据整个邻间隙

答案

参考答案:B

解析:

固定连接体应位于基牙的近中或远中面的接触区,其面积不应小于4mm2,连接体四周外形应圆钝和高度抛光,不能形成狭缝,应形成正常的唇颊、舌外展隙以及邻间隙,切忌将连接体占据整个邻间隙或压迫牙龈,妨碍自洁作用。

单项选择题 B型题
阅读理解

阅读下面文章,回答问题。

(A)

The Taj Mahal is considered to be one of the most beautiful buildings in the world and the finest example of the late style of Indian architecture (建筑). It is at Agra in northern India. It lies beside the River Jumna in the middle of gardens with quiet pools.

   The Taj Mahal was built by the Mogul emperor (皇帝) Shah Jehan, who ruled India in the seventeenth century. It is in memory of his favorite wife, Arjumand Banu Bagam, known as Mumtaz Mahal, who died in 1631. The building, which was completed between 1632 and 1638, was designed by a local Muslim architect (建筑师), Ustad Ahmad Lahori. The whole building, with gardens and gateway structures, was completed in 1643. The Taj Mahal stands at one end of the garden tomb with marble (大理石) path. The room is softly lighted by the light that passes through double screens of carved marble set high in the walls. The building now is kept in good condition.

   The Taj Mahal took 22 years to build. Shah Jehan planned a similar building, but in black instead of white, to lie on the other side of the river. But before it could be built, Shah Jehan was imprisoned (监禁) by his son and buried next to his wife in the Taj Mahal. 

1. The Taj Mahal was built for____ .

A. Mumtaz                     B. Shah

C. Either Mumtaz or Shah         D. Both Mumtaz and Shah

2. The passage mainly tells us____ .

A. why the Taj Mahal was built

B. the love story between Shah and Mumtaz

C. some information about the Taj Mahal

D. the Taj Mahal—the pride of Indians

3. Form the passage we can learn that____ .

A. the Taj Mahal looks more beautiful than before.

B. the Taj Mahal doesn't exist now.

C. the Taj Mahal has completely changed.

D. the Taj Mahal has become a place of interest.

(B)

Winter-swimming has become popular in Beijing. Three years ago, few people would go swimming in the icy waters. But now there is a Winter-swimming Enthusiasts’ Club(冬泳爱好者协会)and it has more than 2 000 members. The oldest is 84 years old and the youngest is only 7. The members are from all walks of life. They may be workers, peasants, soldiers, teachers, students…

Though it is now the coldest part of the season and the water temperature in the city’s lakes is around 0℃, many winter-swimmers still swim in the icy waters, even when it is snowing. They enjoy themselves in the lake, while the people by the side of the lake are wearing heavy clothes.

Why are so many people interested in winter-swimming? Because winter-swimming can be good for one’s health.

Bei Sha is a good example. He is 69, and he once suffered from heart trouble for 26 years. After ten years of winter-swimming he is now in good health. Scientists are now studying the effects of winter-swimming on health.

4. What does the underlined sentence “The members are from all walks of life” mean?  

A. The members do different jobs at different places.

B. They come from all parts of Beijing.

C. They are persons of different ages.

D. They are men and women, old and young.

5. The winter-swimmers are able to swim in the icy waters, even on snowy days because       .

A. they are not afraid of coldness

B. they often swim in the icy waters

C. they know that they can benefit(得益)from it

D. winter-swimming can make people healthy

6. Winter-swimming has become popular in Beijing because       .

A. more and more people like to swim in Beijing

B. it is more interesting than swimming in summer

C. winter-swimmers are brave men

D. winter-swimming does a lot of good to one’s health

7. What’s the best title for this passage?

A. People in Beijing Like Swimming in Winter

B. Winter-swimming—A Craze(狂热)in Beijing

C. People Benefit from Winter-swimming

D. Winter-swimmers Are Brave Men