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.

　　现在很多考生的问题是复习方法本末倒置，花了大量的时间学习和研究考试形式，却忽视了提高阅读能力。

　　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 lets look on the bright side. Given the lack of locks, the Internet is surely the worlds biggest crime-free society. Maybe that is because hackers are fundamentally honest. Or that there currently isnt much to steal. Or because vandalism isnt much fun unless you have a peculiar dislike for someone.

　　Whatever the reason, lets 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.

　　21. By saying owners of well over half of all World Wide Web sites have set up home without fitting locks to their doors , the author means that ______.

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