感染性心内膜炎主要由（）引起，通常分为（）和（）两种。

阅读理解

       There are two deaf(聋的) men in a small village. One is Mr. White and the other is Mr. Black.

They live near to each other. They are good friends.

       Mr. White and Mr. Black often talk together. They talk about all kinds of things. Sometimes they

are worried about their hearing. But one thinks the other is much deafer. 

       One day Mr. Black comes to see Mr. White. Mr. White is sitting on a chair, He is having a rest.

Mr. Black stops at the door and asks, "Can you hear me?" There is no answer. Mr. Black goes nearer

and asks again, "Can you hear me?" Again he doesn't hear any answer. Mr. Black is quite pleased.

Still he goes nearer and asks for the third time, "Can you hear me?" Still there is no answer. At last

Mr. Black goes up to Mr. White and calls, "Now I know you are much deafer than me. You don't

hear my questions." "I'm much deafer?" says Mr. White. "No, I answer you three times. But you do

not hear my answer."

根据短文内容，选择正确答案填空。

1. Mr. White and Mr. Black are                 .       

A. brothers  

B. in the city  

C. not near to each other  

D. in the same village.

2. Mr. White and Mr. Black often                 together.      

A. talk    

B. have a rest    

C. sit at home    

D. go out for a walk

3. One day Mr. Black talks with Mr. White                  .      

A. in Mr. Black's house          

B. in the street

C. at the door of Mr. White's house  

D. happily

4. Which one is right?                

A. Mr. White doesn't answer Mr. Black's question.

B. Mr. Black doesn't hear Mr. White's answer.

C. Mr. White is deafer than Mr. Black

D. Mr. White wouldn't like to answer Mr. Black's question

5. Mr. Black and Mr. White are                    men, I think.   

A. interesting      

B. good        

C. bad          

D. blind

著名画家葛庆友讲道，画画和其他任何艺术形式一样，都需要哲学思辨，“黑与白，直线与斜线，点与面……绘画中蕴涵了很多对比和冲突；不懂辩证法的画家，是创作不出好的作品的。”材料体现出

A．所有哲学都可以促进实践的发展　

B．具体科学是哲学的基础　

C．哲学为具体科学的发展提供世界观和方法论的指导　

D．哲学的智慧产生于人类的实践活动

韩城是我国历史文化名人司马迁的故乡。司马迁的最大历史贡献是写成了 [ ]

A、《史记》

B、《缀术》

C、《资治通鉴》

D、《水经注》

一个数由24个一，3个百分之一和9个千分之一组成，这个数是______，精确到十分位约是______．

滚动轴承7200表示（）轴承。

A.推力球

B.圆锥滚子

C.圆柱滚子

D.螺旋滚子