文档中含有该单元全部六套试卷答案。
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But Farmer is very concerned about the need to alert the public to poor security and, so far, events have proved him right. SATAN has done more to alert people to the risks than cause new disorder.
So is the Net becoming more secure? Far from it. In the early days, when you visited a Web site your browser simply looked at the content. Now the Web is full of tiny programs that automatically download when you look at a Web page, and run on your own machine. These programs could, if their authors wished, do all kinds of nasty things to your computer.
At the same time, the Net is increasingly populated with spiders, worms, agents and other types of automated beasts designed to penetrate the sites and seek out and classify information. All these make wonderful tools for antisocial people who want to invade weak sites and cause damage.
But let’s look on the bright side. Given the lack of locks, the Internet is surely the world’s biggest (almost) crime-free society. Maybe that is because hackers are fundamentally honest. Or that there currently isn’t much to steal. Or because vandalism (恶意破坏) isn’t much fun unless you have a peculiar dislike for someone.
Whatever the reason, let’s enjoy it while we can. But expect it all to change, and security to become the number one issue, when the most influential inhabitants of the Net are selling services they want to be paid for.
31.
By saying "... owners of well over half of all World Wide Web sites have set up home without fitting locks to their doors" (Para. 2), the author means that _____.
A) those happy times appear still to be with us
B) the Internet is surely the world’s biggest crime-free society
C) many sites are not well-protected
D) the Internet is immune to hacking tricks
正确答案： C
32.
SATAN, a program designed by Dan Farmer can be used ____________.
A) to investigate the security of Internet sites
B) to improve the security of the Internet system
C) to imitate hackers by pretending to break into websites
D) to provide the hacking program for the public
正确答案： A
33.
Farmer’s program has been criticized by the public because ________.
A) it causes damage to Net browsers