简述气动仪表的优缺点？

关于出血性脑梗死的叙述正确的是（）

A.常发生在大面积脑梗死之后

B.和面积无关，主要和梗死位置有关

C.风湿性心脏病伴发的梗死易发生该病

D.接近皮质的梗死易发生该病

E.在CT上可见混杂密度改变

确定网络层次结构及各层采用的协议是网络设计中______阶段的主要任务。

A．网络需求分析

B．网络体系结构设计

C．网络设备选型

D．网络安全性设计

阅读理解。

     Face book, the world's biggest social networking site, is celebrating its sixth birthday. The site's

founder, Mark Zuckergerg, states that Face book will continue to work as hard as it has worked in

the last six years in order to stay the web's number one communication site.

     The company started in a dorm room in 2004. Today it has 150 million active users, more than

the 130 million of its competitor MySpace.

     Face book set itself apart from other social networking sites because you can communicate with

people you really know and trust. Before, most people didn't want to share their real identities online.

Face book has given people a safe and trusted environment for people to interact online. It has changed

the way people view the world. A friend from any country is only a few clicks away.

     It was back in February 2004 when Zuckerberg started "the Face book" from a Harvard student's

room. The aim was to help students get in touch with each other over the Internet. Within 24 hours over

a thousand students had signed up and soon after that the network spread out to other universities.

     By 2005 a research study showed that about 85% of the students in the network had a Face book

account. Another survey showed that Face book was almost as important as an iPod. At the end of

2005 Face book came to the UK. And up to today the site has been translated into 35 languages.

      Six years after its start, Face book has escaped the universities and colleges. More than half of its

users are not at college any more and the fastest growing group are the 30 to 40-year-olds. Every day

15 million users update their profiles to tell their friends and the world what's happening to them. They

also share photos, upload videos, chat, make friends, join groups and simply have fun.

1. Face book is different from other social networking sites mainly because _______.

A. it is set up by Zuckerberg in a dorm room  

B. it has changed the way people view the world  

C. it makes people communicate with each other online

D. it provides a safe and trusted environment to communicate online

2. Which of the following is NOT true about Face book?

A. It's the world's biggest social networking site.

B. The site of Face book has been translated into 35 languages.

C. The number of its active users is 20 million more than My Space today.

D. Face book is considered more important than iPod to the students of the UK.

3. On the Face book the users can update their profiles besides ______.

a. uploading videosb. enjoying picturesc. joining groups

d. shopping on linee. chatting with friendsf. making new friends

A. abcde          

B. abcef        

C. acdef      

D. abcdf

4. The passage mainly discusses _______.

A. when Face book is started  

B. what Face book is used for

C. how Face book is developed  

D. why Face book is so popular

2009年10月3日，（）获得2016年夏季奥运会举办权，这是第一次由南美洲举办奥运会。

A.巴西里约热内卢

B.阿根廷布宜诺斯艾利斯

C.智利圣地亚哥

D.秘鲁利马