问题 单项选择题

下述咀嚼运动的功能刺激,在正常建

的作用中不正确的是()

A.促进建立中性

关系

B.通过生理性咀嚼磨耗消除早接触点

C.刺激颌骨的增长

D.促进恒牙的正常萌出

E.促进形成组牙功能

答案

参考答案:E

解析:

[试题难度] 中

[认知层次] 简单应用

正常的咀嚼能够刺激[*]、颌、面的正常发育,其作用大致如下。

(1)咀嚼能磨耗建[*]初期少数牙的早接触,从而建立正常的[*]关系。

(2)咀嚼肌大部分附丽于上、下颌骨,因此,咀嚼运动对颌骨结构及发育,均有一定的功能性刺激。①强而有力的咀嚼肌附丽于下颌骨,因而比上颌骨发育粗壮。下颌角由于咀嚼肌的牵引,向后下突起,其角度由婴儿的钝角至成年逐渐变小。②上、下颌骨为了适应咀嚼力,上颌骨有尖牙支柱、颧突支柱和翼突支柱与颅底相连。各支柱间有骨嵴,以增强结构。三个支柱与对侧形成眶弓、鼻骨弓、颌弓等,加强对咀嚼压力的承受,且各窦腔能将力量加以缓冲和分散,如上颌窦可缓冲力。③牙槽骨内骨小梁排列方向和外力作用相协调形成了牙力轨道和肌力轨道,能耐受外力和咀嚼作用相适应。④颌骨表层因咀嚼肌的附丽,使骨密质坚厚,肌肉附丽处突起成嵴,如内斜嵴、外斜嵴等。

(3)咀嚼肌的功能性收缩,给予牙列、颌、面、颅底的组织以功能性刺激,促进其血液和淋巴循环,增强代谢,使颅、颌、面正常发育。

阅读理解

Cameron thought of himself as merely organized. He certainly did not consider that he took great pains over anything, he did just enough to get it right. Exactly right, of course, for as he was fond of telling his staff, "if it's not exactly right, it's wrong". Occasionally a worker might be sad on hearing these words, because it meant another hour or so of going over the same bit of work, correcting the mistakes which Cameron had patiently pointed out. And doing the corrections exactly right of course.

Strangely enough, his department had the reputation for performing the highest quality work in the company, and it was seen, and not only by those who worked in the department, as a sort of elite (出类拔萃) unit. Those programmes that had to work first time, straight out of the box, Cameron's men got those. "It's mission (任务) critical—give it to Cameron" was almost a catch-phrase with his team.

It helped that Cameron was not merely particular about things. He wanted things done just so, not because of a personal taste, but because he had discovered through patient experimentation that this was the best way for it to be done.

In Cameron's dictionary, "Take as long as you want" meant that you could work on your task not just in office hours, but that evening, and late into the early hours of the following morning if you so desired. But the project had to be in by its completion date, and yes, done exactly right. Or you did it again.

But he would always be regarded, and not least by himself, as someone who had failed to meet requirements, one of those who just couldn't cut it. You had to face it, if you were not working for Cameron, you were second best. So when word got out that Cameron had messed up, big time, the news was greeted with a mixture of sympathy, and entire relief that this perfection too was human.

小题1:Cameron was a___________.

A.software programmer

B.a chief scientist

C.quality controller

D.head of department小题2:"Mission-critical" work was given to Cameron because___________.

A.Cameron's work was error-free

B.Cameron was critical

C.he didn't mind working late

D.he had a good team小题3:Working for Cameron, people felt that___________.

A.they were part of an elite

B.their mission was critical

C.Cameron was very particular about things

D.Cameron was patient and responsible小题4:According to the underlined part in Paragraph 5, what is meant by someone “who couldn't cut it” ?

A.He didn’t cut corners.

B.He wasn't good enough.

C.He had the wrong measurements.

D.He was a perfection.小题5:What can we learn about Cameron?

A.He never got things wrong.

B.He didn’t allow for any mistake.

C.He encouraged work to be done in office hours.

D.He was often misunderstood.小题6:The attitude of the author towards Cameron is that of being___________.

A.positive

B.sympathetic

C.non-subjective

D.optimistic

单项选择题