A.Because there is no one in charge of the Internet.
B.Because some people like to buy banned products on the Internet.
C.Because X-rated materials, ecause people who operate businesses on the Internet are criminals.
()17.Parental controls are needed when children use the Internet because ________.()18.We________.
A.to improve the computers
B.to improve people's moral level
C.to order people not to use the Internet
D.to find a medicine to kill computer viruses
三、根据短文内容从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。Internet activities of their children. 19.______ But they might not have considered how they're going to ensure(确保) kids' safety online. Here are a number of tips to help protect kids' safety online.______ A good understanding of technologies such as QQ, e-mail, (论坛), chat rooms, and social networking sites will all be important for ensuring kids' safety online.
21.______ For example, in the beginning you may insist that the Internet only be used while the child is accompanied by a parent. This would be useful for guiding your children through their “first-time” experiences on the web and making sure that they develop good online habits.
Keep the computer in a central place to ensure that your kids' online behavior is being watched. You don't need to stand over them, but just knowing that you are there will make them less likely to search the web for negative information.
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