Hacking People tend to think of computers as isolated machines, working away all by themselves. Some do-personal computer without an outside link, like someones hideaway cabin in the woods. But just as most of homes are tied to a community by streets, bus routes and electric lines, computers that exchange intelligence are part of a community m local, national and even global network joined by telephone connections. Hacking, our electronic-age term for computer break-in, is more and more in the news-brainy kids vandalizing university records, even pranking about in supposedly safeguarded systems. To those who understand how computer networks are increasingly regulating life in the late 20th century, these are not laughing matters. A potential for disaster is building: A dissatisfied former insurance-company employee wipes out information from payroll files. A student sends out a virus, a secret and destructive command, over a national network. The virus copies itself at lightning speed, jamming the entire network thousands of academic, commercial and government computer systems. Such disastrous cases have already occurred. Now exists the possibility of terrorism by computer. Spoiling a system responsible for air-traffic control at a busy airport, or knocking out the telephones of a major city, is a relatively easy way to spread panic. Yet neither business nor government has done enough to toughen its defenses against attack. For one thing, such defenses are expensive; for another, they may interrupt communication the main reason for using computers in the first place. A to show that a hacker is more dangerous than a thief. C to demand that a protective computer system should be set up against thieves. 37 The word vandalizing in Line 17 means B creating. D updating, A Hacking is also known as computer break-in. C Hacking is a widespread concern. 39 Which of the following is NOT mentioned in the passage as an instance of attack by a hacker? B Shutting down the computer whenever he wishes. D Spoiling a system for air traffic. A it will cause fear among the public. C tough measures are illegal. 【参考答案】36. A37. C38. B39. C40. D
上海本地版英语三上《Unit 12 The four seasons》PPT课件2
上海本地版英语三上《Unit 2 How are you》PPT课件2
上海本地版英语三上《Unit 8 At the fruit shop》PPT课件1
上海本地版英语三上《Unit 5 My family》PPT课件2
上海本地版英语三上《Unit 2 My family》PPT课件
上海本地版英语三上《Unit 2 How are you》PPT课件3
上海本地版英语三上《Unit 7 In the classroom》PPT课件1
牛津沪教三上Module 1《Unit 4 Sauing and doing》flash课件(enjoy)
牛津沪教二上《Unit 2 A snack bar》ppt课件
牛津沪教二上《Unit 4 Going about》flash课件之二
上海本地版英语三上《Unit 2 How are you》PPT课件
牛津沪教二上《Unit 1 where I live》flash课件之四
牛津沪教二上《Unit 4 Going about》flash课件
上海本地版英语三上《Unit 12 The four seasons》PPT课件1
牛津沪教二上《Unit 3 Things I like to do》flash课件之三
上海本地版英语三上《Unit 8 At the fruit shop》PPT课件3
上海本地版英语三上《Unit 2 How are you》PPT课件1
上海本地版英语三上《Unit 11 Small animals》PPT课件1
牛津沪教三上Module 1《Unit 3 in the classroom》flash课件(talk)
牛津沪教二上《Unit 3 Things I like to do》flash课件之二
上海本地版英语三上《Unit 8 At the fruit shop》PPT课件2
上海本地版英语三上《Unit 3 Plants》PPT课件
牛津沪教三上Module 1《Unit 2 Greetings》ppt课件
上海本地版英语三上《Unit 2 What’s your name》PPT课件
上海本地版英语三上《Unit 2 My family》PPT课件1
牛津沪教二上《Unit 1 where I live》flash课件之三
上海本地版英语三上《Unit 9 In my room》PPT课件1
上海本地版英语三上《Unit 11 Small animals》PPT课件2
上海本地版英语三上《Unit 2 On the farm》PPT课件
牛津沪教二上《Unit 3 Things I like to do》flash课件
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |