下列图示的实验操作中，正确的是[ ] A. B. C. D.

对1945-1975年间1000名从事油漆镭盘的表厂女工，与从事电话员工作的1000名妇女的骨癌发生情况进行对比，其间从事油漆镭盘的工人中发生了20例，电话员中发生了4例骨癌。从事油漆镭盘工人发生骨癌的相对危险度是（）

A.2

B.4

C.8

D.5

E.由上述资料不能计算

第二部分：阅读理解(第一节20小题。第二节5小题；每小题2分，满分50分)

第一节：阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项，并在答题纸上将该

选项标号涂黑。

When you are little, the whole world feels like a big playground. I was living in Conyers, Georgia the summer it all happened. I was a second grader, but my best friend Stephanie was only in the first grade. Both of our parents were at work and most of the time they let us go our own way.

It was a hot afternoon and we decided to have an adventure in Stephanie's basement. As I opened the basement door, before us lay the biggest room, full of amazing things like guns, dolls, and old clothes. I ran downstairs, and spotted a red steel can. It was paint. I looked beyond it and there lay even more paint in bright colors like purple, orange, blue and green.

"Stephanie, I just found us a project for the day. Get some paintbrushes. We are fixing to paint. " She screamed with excitement as I told her of my secret plans and immediately we got to work. We gathered all the brushes we could find and moved all of our materials to my yard. There on the road in front of my house, we painted big stripes ( 条纹) of colors across the pavement (人行道). Stripe by stripe, our colors turned into a beautiful rainbow. It was fantastic!

The sun was starting to sink. I saw a car in the distance and jumped up as I recognized the car. It was my mother. I couldn't wait to show her my masterpiece. The car pulled slowly into the driveway and from the look on my mother's face, I could tell that I was in deep trouble.

My mother shut the ear door and walked towards me. Her eyes glaring, she shouted, "What in the world were you thinking? I understood when you made castles out of leaves, and climbed the neighbors' trees, but this! Come inside right now !" I stood there glaring back at her for a minute, angry because she had insulted (侮辱) my art.

"Now go clean it up!" Mother and I began cleaning the road. Tears ran down my cheeks as I saw my beautiful rainbow turn into black cement.

Though years have now passed, I still wonder where my rainbow has gone. I wonder if, maybe when I get older, I can find my rainbow and never have to brush it away. I guess we all need some sort of rainbow to brighten our lives from time to time and to keep our hopes and dreams colorful.

1. What did the writer want to do when his mother came home?

A. To introduce Stephanie to her.          B. To prevent her from seeing his painting.

C. To put the materials back in the yard.    D. To show his artwork to her.

2. In his mother's eyes, the writer __ .

A. was a born artist                          B. always caused trouble

C. was a problem solver                      D. worked very hard

3. The underlined word "rainbow" in the last paragraph refers to __ .

A. the rainbow in the sky                    B. the stripes on the pavement

C. something imaginative and fun              D. important lessons learned in childhood

4. It can be learned from the passage that parents should       .

A. encourage children to paint          

B. value friendship among children

C. discover the hidden talent in children 

D. protect rather than destroy children's dreams

下面关于OSPF的特殊区域的描述错误的是（）

A.完全末节区域的作用是允许ABR发布的LSA3缺省路由，不允许自治系统外部路由和区域间的路由

B.末节区域和完全末节区域的不同在于该区域允许域间路由

C.NSSA区域和末节区域的不同在于该区域允许自治系统外部路由的引入，由ABR发布LSA7通告给本区域

D.完全末节区域和NSSA区域的不同在于该区域不允许域间路由

由于mtDNA的分子进化速度比核DNA快，因此mtDNA分子的分析对真菌种内和种间的分类灵敏度高。（）

CRH5型动车组辅助供电系统采用干线供电方式，供电制式为AC（）V和DC24V。

A、380

B、400

C、420

D、460