问题 单项选择题

邻双面的洞底形成阶梯,使力主要由()

A.面髓壁和邻面龈壁分担

B.面髓壁和邻面轴壁分担

C.面侧壁和邻面龈壁分担

D.面侧壁和邻面侧壁分担

E.面髓壁和邻面侧壁分担

答案

参考答案:A

解析:邻双面的洞底形成阶梯,使牙力主要由垂直方向承担,这样有利于牙周组织健康,也使得充填体或者修复体不容易受到破坏,所以主要由面髓壁和邻面龈壁分担,所以A正确。邻面轴壁、面侧壁、邻面侧壁都不在力的垂直方向,所以B、C、D、E错误。此题选A。考点:邻双面的洞底要求

阅读理解

On May 23, six pandas left an important panda base (基地) in Wolong, southwest China’s Sichuan Province(四川省), because of damaged (损坏的) shelters and food shortages(短缺)after the May 12 earthquake(地震), The pandas took trucks(卡车) to Ya’an,a local official(官员) said.

Eight other pandas left the Chengdu Research Base on May 18. They will take China Southern Airlines (CSA) to Beijing. They will travel on a Boeing 747-700 plane with bamboo and water. and they will stay at the Beijing Zoo, said Wolong director Zhang Hemin.

“There is enough water now, but food is still a big problem. The pandas need bamboos and apples.” Zhang Hemin said. 

After the earthquake, the center needed lots of bamboo shoots, apples, eggs, milk powder and medicine, she said.

There are about 1,590 pandas living in the wild in China, mostly in Sichuan and the northwestern provinces of Shanxi and Gansu.

小题1:How many pandas left for Ya’an?

A.6

B.8

C.14

D.1590小题2:How will eight other pandas go to Beijing Zoo from the Chengdu Research Base?

A.By plane

B.By train

C.By truck

D.By bus小题3:In China,what place has the most giant pandas?

A.Beijing

B.Sichuan and the northwestern provinces

C.northeastern provinces

D.Jiangsu小题4:Which of the following sentences is NOT true according to the passage?

A.Some pandas left an important panda base in Wolong after the earthquake.

B.Eight other pandas will stay at Beijing zoo.

C.Pandas eat bamboo shoots, apples, eggs, milk powder and so on.

D.Water is still a big problem for the pandas after the earthquake.小题5:This passage is probably(很可能) from ________________.

A.a novel(小说)

B.a storybook

C.a newspaper

D.a diary(日记)

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