问题 问答题 简答题

简述人体中骨骼的数量及分布有何特点?

答案

参考答案:

人体中的骨骼共有206块,可将它们分成两大部分即:①中轴骨:是指位于身体中轴部位(除四肢骨)的骨。颅骨29块:额骨1块、顶骨2块、枕骨1块、蝶骨1块、颞骨2块、筛骨1块(以上属于脑颅骨);上颌骨2块、腭骨2块、颧骨2块、鼻骨2块、泪骨2块、下鼻甲骨2块、下颌骨1块、梨骨1块、舌骨1块(以上属于面颅骨);听小骨共有6块,两侧对称,每侧3块听小骨,根据其位置自外向内依次是锤骨、砧骨和镫骨。椎骨26块:颈椎7块、胸椎12块、腰椎5块、骶骨1块、尾骨1块。肋骨24块、胸骨1块②四肢骨:共126块,上肢骨64块、下肢骨62块、主要包括:肩胛骨2块、锁骨2块、肱骨2块、尺骨2块、桡骨2块、腕骨16块、掌骨10块、指骨28块。髋骨2块、股骨2块、腓骨2块、胫骨2块、髌骨2块、跗骨14块、蹠骨10块、趾骨28块。

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     Thirty years ago not many people would have dreamed of doing the repairs and decorations in

their own homes. In those days labor was fairly cheap and most people would have thought it

worthwhile to employ a professional painter and decorator, unless of course they were either very

hand up or were in the trade themselves. Today, however, it is quite a different story. Men and

women in all walks of life turn their hands to all sorts of jobs round the house including painting,

papering, putting up shelves and wall units, and tiling walls and floors. Some people with no

professional training of any kind have even successfully built their own houses. These jobs have

been made easier today by the introduction of prepared materials, which require the minimum amount

of skill to use. In every high street throughout Britain nowadays there is at least one

"Do-it-Yourself" shop containing a vast range of timber, tiles, paints, wallpapers and floor

coverings besides tools of every description including power drills and many accessories.

"Do-it-Yourself" is a booming business; all these shops do a roaring trade and look like continuing

to do so. Probably the main reason for the craze is the high cost of present-day labor and the shortage

of building firms willing to do small jobs.

1. Why did people employ professional workers to decorate homes thirty years ago?  

A. Because they could not do it themselves.  

B. Because professional workers were very cheap.  

C. Because they had no time.  

D. Because professional workers could do much better.

2. Thirty years later what changes took place?  

A. People could do everything themselves.  

B. Few people chose to be a professional worker.  

C. People with no professional training successfully built their own houses.  

D. New expensive materials required no skills at all.

3. What caused the DIY craze?  

A. Young people liked to follow the fashion.  

B. "Do-it-Yourself" is a booming business.  

C. There were fewer building companies.  

D. High cost of professional workers.

4. What is the speaker telling us?  

A. How DIY comes into being.  

B. Changes in building.  

C. Changes in housing.  

D. Great changes in these thirty years.