甲醛用作固定剂的实际浓度是（）。 A.50% B.4% C.10% D.15% E.

阅读理解。

     A 14-year-old boy from the USA was described as a hero yesterday after he saved the life of a girl in

another country.

     Dean Bluey from Dallas, Texas, was a school boy who was interested in computer. One day, he was

sending an e-mail to a friend on the Internet. Suddenly he received a message saying "Help! Help! Help!"

The message was from Finland, thousands of kilometers way from the USA.

     "I didn't know what I should do," Dean said to a reporter. "It was really difficult to tell if the message

was real." So Dean did nothing at first. But the message kept coming.

     "By then it was easy to see that someone was in trouble," Dean explained. He replied and discovered

that the sender was a 20-year-old student called Tarja, who was alone in a university library. She was very

ill. What was worse, there was no phone around her. Her only way of communicating with the world was

by e-mail.

     Dean got in touch with the Texas police. The police immediately realized that the situation was quite

serious. They found it necessary to call the police in Finland. Then an ambulance＊ rushed to the university,

and soon doctors found Tarja. Luckily, she was still alive and was quickly sent to the hospital.

     "I'm glad she's OK," Dean said. "It's hard to believe, but e-mail saved her life."

1. What was Dean doing when he was asked for help?

A. Meeting a friend.

B. Reading in the library.

C. Sending an e-mail.

D. Playing computer games.

2. What did Dean think of the message after he received it for the first time? 

A. He thought it was real.

B. He thought it was interesting.

C. He believed it.

D. He didn't know if the message was real.

3. How did Tarja communicate with the world without phone?

A. she sent e-mails.

B. she shouted aloud.

C. she wrote letters.

D. she knocked at the door.

4. What does the writer want to tell us in the news?

A. Dean is very kind.

B. The Internet is becoming very helpful.

C. We must help others.

D. There must be some doctors in school libraries.

洋葱、番茄、草履虫等生物体都是由许多细胞组成的．______

改：______．

三叉神经痛的下列哪项表述是正确的（）

A.突然发作，亦骤然停止

B.每次发作数秒至l～2分钟

C.伴三叉神经支配区痛觉缺失

D.可引起痛性抽搐

E.为周期性病程，有长短不等的缓解期

我国大力推进城乡社区建设，构建基层社会管理和服务平台。将种种做法归纳起来，其对社区的建设包涵资源的投放、完善社区福利，还有就是加强公共伦理建设，引导共同价值观形成，以及政府跟民众之间良好的沟通机制，民众以什么样的渠道去有效表达诉求。我国社区建设的实践表明（   ）

① 推进城乡社区建设是实现基层群众自治的重要途径

② 提供社区公共服务是构建基层社会管理平台的主要目标

③ 构建基层社会管理平台是对政府行政管理体制的创新

④ 构建基层社会管理平台对人民代表大会制度的完善

A．①②

B．①③

C．②④

D．③④

阅读以下关于网上交易系统的叙述，回答问题。
某电子商务公司进行机构重组后，业务规模和用户规模不断扩大，现有的在线销售系统已经无法满足公司的发展要求。公司决策层对现有系统的不足进行了认真分析，决定提高现有系统客户端访问速度，增强客户端的动态交互能力，并提高整个系统代码的模块化和重用性，最终完成网上交易系统的改造与升级。在对该系统的升级方案进行设计和讨论时，公司的系统分析师王工提出采用开发浏览器插件的方式提高客户端访问速度并增强访问体验，通过重写服务端代码提高系统的模块化和重用性。另外一位系统分析师李工则提出采用Ajax技术提高客户端性能，采用.JavaSciipt技术进一步增强客户端的动态交互能力，并在服务端采用JavaScript技术提高系统代码的模块化和重用性。公司的分析师和架构师对这两种思路进行讨论与评估，最终采纳了李工的方法。

请说明什么是Ajax技术，并从信息表示、动态显示及交互、数据交换和异步数据交换四个功能特点说明Ajax包含的基本技术，对应填入表中的(1)、(2)、(3)、(4)窄白中。