（）和（）的人员不得进入生产区和质量控制区，特殊情况确需进入的，应当事先对（）、更衣

--- Do you think you will be able to finish your writing by five o’clock today?

--- __________. I’ll be busy with experiments all day.

A．Not a chance

B．Not a little

C．Not to mention it

D．No wonder

自首的构成条件是( )。

A．被捕后自动供述自己罪行的

B．犯罪后自动投案的

C．如实供述自己罪行的

D．只供述犯罪的部分情况的

阅读理解。

     We can achieve knowledge either actively or passivelr(被动地). We achieve it actively by

direct experience,by testing and piroving an idea,or by reasoning.

    We achieve knowledge passively by being told by someoneelse. Most of the learning that

takes place in the classroom and thekind that happens when we watch TV or read newspapers

ormagazines is passive. Conditioned as we are to passive leaning,it'snot surprising that we

depend on it in our everyday communication with friends and co-workers.

    Unfortunately,passive learning has a serious problem. It makes us tend to accept what we

are told even when it is little more than hear say and rumor(谣言).

    Did you ever play the game Rumor? It begins when one personwrites down a message but

doesn' t show it to anyone. Then the person whispers it,word for word, to another person.That

person,inturn,whispers it to still another, and so on, through all the peopleplaying the game. The

last person writes down the message word forword as he or she hears it. Then the two written

statements arec ompared. Typically, the original message has changed.

    That' s what happens in daily life. The simple fact that peoplerepeat a story in their own words

changes the story.Then,too,most people listen imperfectly. And many enjoy adding their own

creativetouch to a story,trying to improve on it,stamping(打上标记)it with their own personal

style. Yet those who hear it think they know.

    This process is also found among scholars and authors:Astatement of opinion by one writer

may be re-stated as fact by another,who may in turn be quoted by yet another；and this process

may continue,unless it occurs to someone to question the facts onwhich the origihal writer based

his opinion or to challenge the interpretation he placed upon those facts.

1. According to the passage,passive learning may occur in______. 

A. doing a medical experiment  

B. solving a math problem

C.visiting an exhibition  

D.doing scientific reasoning

2. The underlined word"it"in Paragraph 2 refers to________.

A.active learning        

B. knowledge        

C. communication    

D. passive learning

3. The author mentions the game Rumor to show that_________.

A. a message may be changed when being passed on

B. a message should be delivered in different ways

C. people may have problems with their sense of hearing

D. people tend not to believe in what they know as rumor

4. What can we infer from the passage?

A. Active learning is less important.

B. Passive learning may not be reliable.

C. Active learning occurs more frequently.

D. Passive learning is not found among scholars.

阅读以下关于信息系统安全性的说明。

[说明]

某大型跨国企业的IT部门一年前基于SOA(Service-Oriented Architecture)对企业原有的多个信息系统进行了集成，实现了原有各系统之间的互连互通，搭建了支撑企业完整业务流程运作的统一信息系统平台。随着集成后系统的投入运行，IT部门发现在满足企业正常业务运作要求的同时，系统也暴露出明显的安全性缺陷，并在近期出现了企业敏感业务数据泄漏及系统核心业务功能非授权访问等严重安全事件。针对这一情况，企业决定由IT部门成立专门的项目组负责提高现有系统的安全性。
项目组在仔细调研和分析了系统现有安全性问题的基础上，决定首先为在网络中传输的数据提供机密性(Confidentiality)与完整性(Integrity)保障，同时为系统核心业务功能的访问提供访问控制机制，以保证只有授权用户才能使用特定功能。
经过分析和讨论，项目组决定采用加密技术为网络中传输的数据提供机密性与完整性保障。但在确定具体访问控制机制时，张工认为应该采用传统的强制访问控制(Mandatory Access Control)机制，而王工则建议采用基于角色的访问控制(Role-BasedAccess Control)与可扩展访问控制标记语言(eXtensible Access Control Markup Language，XACML)相结合的机制。项目组经过集体讨论，最终采用了王工的方案。

请用400字以内的文字，分别针对采用对称加密策略与公钥加密策略，说明如何利用加密技术为在网络中传输的数据提供机密性与完整性保障。

强碱性阴离子交换树脂受铁污染后会出现（）现象。

A.颜色变黑

B.性能不变

C.再生效率降低

D.再生剂用量和清洗水耗量增大