Everybody knows that knives _______.

A. used to cut things B. are used to cutting things C. are used for cutting things

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Maybe you think that many parents have a lot to learn about what their children are doing online. According to a recent survey by Symantec Company, which makes many kinds of security(安全)software for home and business computers, there's a "huge difference between parents and their kids".

Parents of children under the age of 18 were asked to estimate(估計)how much time their kids spent online each week. The parents said about three hours a week on average(平均).The kids－ages 8 to 17－who took the survey said they were spending an average of seven hours online each week.

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And what are the kids doing on the Web? "They're doing things, like downloading music, they're going to social networking sites, they're actually shopping online when parents don't think they're doing those kinds of activities," says Rosenkrantz. "They're also, we think, doing some things with research papers and other kinds of activities with homework maybe where they're getting some information online and they really shouldn't be." Nearly a quarter of the kids (23 percent) night do things their parents would not agree.

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D. To give reasons for kids' bad Internet habits.

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