[分享]大学体验英语综合教程2Unit8-computersandsecurity

Unit 8 Computers and Security
Passage A: Y ou Are the W eakest 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 th e In tern et? Ex plain.
Reference:Y es, I often do, as I like to explore the potentialities of the Internet. Many people al so 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 compu ter? If so, wh at i s 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 compu ter viru ses perman en tly? 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 believ e ev ery thing y ou 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 h ave f org otten all about him.
3.encounter v.
1) meet or be faced by (something bad, especially a dang er 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 en countered a policem an.
4. unusual: adj. not common; rare
Examples:
It’s unusual to find diamonds of this size.
Earlier this century, it was unusu al for women to h ave 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:
Y ou can only be infected with with HIV in a limited num ber of way s.
Lucy’s enthusiasm soon infected the rest of the class.
6. transmit: vt. send or pass from on e person, pl ace or thing to an oth er.
Examples:
The US Open will be transmitted via satellite.
Do you know that an infection may be tran smitted by m osquitoes?
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 th ose smart ri ch people.
9. ensure: vt. make (something certain) to happen
Examples:
All necessary steps have been taken to ensu re th ei r saf ety.
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 adequ ate 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 g reat in amoun t, size, or deg ree
Examples:
He has been ill for a considerable time.
The sun was now high in the sky, an d th e h eat v ery consi derabl e.
14. identify: vt. prove or show wh o or wh at som ebody 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 si de.
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 infecti on could set in.
He must try and get my garden tidied up before the bad weath er 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 un der 5 are at ri sk.
The economy will fall further, putting m ore jobs at ri sk.
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 viru ses.
2. Companies now realize that viruses aren’t “urban myths” and can 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 an d protected ag ainst.
With the fast spread of information through networked computers and the Internet, a virus can reach many computers before anything can be don e abou t it.
4. Complacency can set 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 computer 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 em ploy ees might n ot 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.。