问题 解答题

如图示长骨的结构,请据图回答:

(1)图中标号②所示结构对骨具有______作用.

(2)骨折后的愈合主要依靠标号______ 所示结构内的成骨细胞的作用.

(3)标号④所示结构在婴幼儿时期呈______ 色,成年后转变成______色.

答案

图中所示的结构分别是:①、关节软骨 ②、血管 ③、骨膜 ④、骨髓 ⑤、骨髓腔 

对于骨的基本结构组成及其功能我们可以借助以下知识结构图来分析:

(1)图中标号②所示结构血管对骨具有营养作用.

(2)骨膜内有成骨细胞,与骨折后的修复愈合和骨的长粗有关,因此骨折后的愈合主要依靠标号[3]所示结构骨膜内的成骨细胞的作用.

(3)标号④骨髓所示结构在婴幼儿时期呈红色,有造血功能;成年后转变成黄色,没有造血功能,但是当大量失血时可以恢复造血功能.

故答案为:

(1)营养  

(2)③

(3)红;黄

选择题
阅读理解

阅读理解

     High school is tough. And if you were to ask Pink her opinion on the subject she'd tell you the same.

Before she became famous, and when she was still called Alicia Moore, the young superstar faced more

than her fair share of high school drama.

     In her interview with Faze, Pink admits she was sorted as a troublemaker at school, "The problem

was, I was labelled as trouble-so I was like 'trouble'. I'll show you trouble. You want trouble, well here

it is!"

     Unfortunately, Pink began to deliver what the teachers expected and the vicious cycle began. "It's

like the label they give you, you grow into it anyway. They treat you bad, so you act bad," Pink says

and continues. "Did I deserve it?-in the end yes, but I feel I just conformed to the label they gave me.

I think a lot of kids just get frustrated and act the way the teachers expect them to."

     It's no surprise that eventually Pink developed a problem with authority, "When they would say it

had to be a certain way I would ask, 'why?' They'd say, 'Because it always has,' so I'd try to prove

them wrong."

     Predictably, Pink dropped out of school and soon after began to sing in nightclubs. She sang any

chance she could get and was eventually discovered by a talent scout (星探) while singing in a club in

Philadelphia. She does not regret anything she has done and would not change her past if she could.

"To change that would change who I am," she said in her Faze interview. She believes having faced so

many difficulties at a young age is a good thing. "To experience the good you have to have seen the bad.

Plus it makes you appreciate blessings more," she says.

     Pink encourages us to be ourselves and not to worry about being labelled. "Just wait," she says.

"Give it a couple of years then it won't matter. Because no matter what label they give you, the best

thing you can do is prove them wrong."

1.  According to the passage, what is Pink's suggestion?

A. Do it your way.                    

B. To be confident.

C. Don't make trouble.                

D. To be happy.

 2. What does the underlined word "labelled" in the second paragraph mean?

A. Known.                            

B. Realized.

C. Classified.                          

D. Discovered.

3. The passage implies that students ________.

A. will usually follow their teachers' advice

B. will act the way their parents expect them to

C. are likely to behave in a bad way as others expect

D. are willing to meet with many difficulties

4. Pink felt that high school was hard because ________.

A. she fell behind others              

B. she was misunderstood

C. she was unsuccessful                      

D. she felt lonely