大学体验英语综合教程2Unit8-computersandsecurity

Unit 8 Computers and Security

Passage A: You Are the Weakest Link, Goodbye I.Teaching Objectives

1. To let students master some important new words and expressions listed from

P193-195.

2. To let students learn something about the computer viruses through the passage A.

II.Time Allotment

1st period: Lead-in(Questions)(5min) 2nd period: Related Information(10min)

3rd period: Detailed Study of the Text(Learning new words, expressions and discussing Passage A)(55min)

4th period: Doing the Exercises from P154-156(30min) 5th period: Assignment Ⅲ. Teaching Procedures 1. Lead-in Questions

1.Do you often download free software from the Internet? Explain.

Reference:Yes, I often do, as I like to explore the potentialities of the Internet. Many people also welcome free software because they don’t have to pay for it. Others don’t do so because there is no protection guaranteed against viruses.

2. Have you installed anti-virus software on your computer? If so, what is it? Reference:There are different kinds of anti-virus software, e.g. Norton, Rising Star and some others. The computers I use in the library all have one kind or another of software installed to prevent viruses from being brought in.

3. Is it possible for us to find a way to get rid of computer viruses permanently? Reference:When old types of viruses have been taken care of, new ones may appear. It would be impossible to get rid of computer viruses permanently.

2.Related Information

Macro viruses are computer viruses that use an application's own macro programming language to distribute themselves. These macros have the potential to inflict damage to the document or to other computer software. The infecting files can be modified or deleted and may not be recoverable.The virus is circulating through email and affecting many customers. If run, the virus could overwrite .jpg, .mp3, and other file types, and attempt to send a copy of itself to everyone in the recipient's address book.

3.Detailed Study of the Text Language Points

1.innocent: adj.( of things) harmless, knowing nothing of evil or wrong; (of people)

guiltless Examples:

Don’t be so innocent as to believe everything you see. Is she guilty or innocent of the crime? 2. or so: about Examples:

She will be back in a day or so.

In another year or so, Lucy will have forgotten all about him. 3.encounter v.

1) meet or be faced by (something bad, especially a danger or a difficulty) Examples:

The plane encountered a storm over the Rockies.

They encountered little resistance to the plan. 2) meet unexpectedly Examples:

He encountered many interesting people on his travels. They came sneaking round the corner and encountered a policeman.

4. unusual: adj. not common; rare Examples:

It’s unusual to find diamonds of this size.

Earlier this century, it was unusual for women to have a career. 5. infect: vt.

1) fill with disease, germs; give disease to (a person); 2) If your excitement, eagerness etc. other people, it makes them begin to feel the same way.

Examples:

You can only be infected with with HIV in a limited number of ways.

Lucy’s enthusiasm soon infected the rest of the class. 6. transmit: vt. send or pass from one person, place or thing to another. Examples:

The US Open will be transmitted via satellite.

Do you know that an infection may be transmitted by mosquitoes?

7. clean up: clean thoroughly Examples:

We spent all Saturday morning cleaning up. Let me just go and clean myself up. 8. in place: in the right or proper place Examples:

Have you got all the lights in place yet?

cf. out of place

Examples: I felt completely out of place among all those smart rich people.

9. ensure: vt. make (something certain) to happen Examples:

All necessary steps have been taken to ensure their safety. His husband ensured that he took all his pills every day. 10. adequate: adj. enough for the purpose Examples:

Without the proper resources the department cannot do an adequate job.

Are the parking facilities adequate for fifty cars? 11.detect: vt. find out; notice Examples:

Many forms of cancer can be cured if detected early. Do I detect a note of sarcasm in your voice? adj. Detectable

12. update: vt. make more modern or up-to-date Examples:

We need to update the defensive weaponry. The files need updating.

13. considerable: adj. fairly large or great in amount, size, or degree

Examples:

He has been ill for a considerable time.

The sun was now high in the sky, and the heat very considerable.

14. identify: vt. prove or show who or what somebody is or something is Examples:

The light was too dim for me to identify her.

I identify myself first.

They were reluctant to identify themselves fully with any particular side.

15. inflict: vt. give (a blow, etc); cause to suffer Examples:

They won’t let any foreign power inflict any further blows on their national pride.

Our army is inflicting heavy losses on the enemy. 16. set in: begin and (probably) continue Examples:

Luckily the wound was treated before infection could set in. He must try and get my garden tidied up before the bad weather sets in. 17. recede: vt. (of thing) move back or away

Examples:

The coast receded as we sailed away. The plane gradually receded out of sigh 18. at risk: in danger Examples:

The disease is spreading, and all children under 5 are at risk. The economy will fall further, putting more jobs at risk. 19. more often than not: in most cases Examples:

On weekends, more often than not, you’d find my uncle at work.

More often than not the patient recovers. 21.odd adj.

1) not regular, habitual, or fixed; occasional 2) strange; unusual Examples:

He had some odd change in his pocket.

It is odd that I can’t remember Mary’s address.

22. as a matter of course: as a regular habit or usual procedure

Examples:

I check my e-mail every morning as a matter of course. Notes to the Text

1.It wasn’t unusual to find hundreds of commuters within one company infected by viruses transmitted via email attachments.

As often the case that in the same company hundreds of computers would have viruses if the employees had opened email attachments containing these viruses.

2. Companies now realize that viruses aren’t “urban myths” and ca n have a serious impact on their operations.

Companies now understand that viruses are not modern made-up stories, and they can do great harm to a company’s operations.

3. With the rapid transmission of files through networks and the Internet, a virus can spread a considerable distance before it can be identified and protected against.

With the fast spread of information through networked computers and the Internet, a virus can reach many computers before anything can be done about it.

4. Complacency can se t in when there is no perceived “action” on the virus front and no global crisis and the importance of being vigilant about viruses recedes in your users’ minds.

People may ignore viruses and stop worrying about them when no major worldwide viruses have been reported recently, and the need to be very on guard against viruses if easily

forgotten

6. Virus writers and hackers often use such software as the ideal “kick-start” for their virus distribution.

Virus writers and people who break into other people’s c omputer files often use such software as the best means to get their viruses to start spreading.

Summary

The weakest link in the protection of a company's computers against viruses is the individual computer user. There is a strong tendency that the employees assume it is the company's computer security experts' job to worry about the viruses and they can bring the problem under control. But everyone must do their share to prevent viruses. Any unsolicited email attachment or any untested type of software may contain a virus.Even the best anti-virus software is not always effective and must be frequently updated. Constant education of all employees about viruses is the key to

virus prevention. No one should ever be allowed to relax their defenses, even if this means the company must have some rules set that employees might not like.

4.Doing the Exercises(omitted) Ⅳ.Assignment

Ask students to read the passage and the new words again, try to recite the new words and the translations on P156.