problem is still in its infancy," said Elias Aboujaoude, a Stanford professor. No single online activity is to blame for excessive use, he said. "They're online in chat rooms, checking e-mail, or writing blogs. [The problem is] not limited to porn (色情) or gambling" websites.
　　Excessive Internet use should be defined not by the number of hours spent online but "in terms of losses," said Maressa Orzack, a Harvard University professor. "If it's a loss [where] you're not getting to work, and family relationships are breaking down as a result, then it's too much."
　　Since the early 1990s, several clinics have been established in the U. S. to treat heavy Internet users. They include the Center for Internet Addiction Recovery and the Center for Internet Behavior.
　　The website for Orzack's center lists the following among the psychological symptoms of computer addiction:
　　● Having a sense of well-being (幸福) or excitement while at the computer.
　　● Longing for more and more time at the computer.
　　● Neglect of family and friends.
　　● Feeling empty, depressed or irritable when not at the computer.
　　● Lying to employers and family about activities.
　　● Inability to stop the activity.
　　● Problems with school or job.
　　Physical symptoms listed include dry eyes, backaches, skipping meals, poor personal hygiene (卫生) and sleep disturbances.
　　People who struggle with excessive Internet use maybe depressed or have other mood disorders, Orzack said. When she discusses Internet habits with her patients, they often report that being online offers a "sense of belonging, and escape, excitement [and] fun," she said. "Some people say relief…because they find themselves so relaxed."
　　Some parts of the Internet seem to draw people in more than others. Internet gamers spend countless hours competing in games against people from all over the world. One such game, called World of Warcraft, is cited on many sites by posters complaining of a "gaming addiction."
　　Andrew Heidrich, an education network administrator from Sacramento, plays World of Warcraft for about two to four hours every other night, but that's nothing compared with the 40 to 60 hours a week he spent playing online games when he was in college. He cut back only after a full-scale family intervention (干预), in which relatives told him he'd gained weight.
　　"There's this whole culture of competition that sucks people in" with online gaming, said Heidrich, now a father of two. "People do it at the expense of everything that was a constant in their lives." Heidrich now visits websites that discuss gaming addiction regularly "to remind myself to keep my love for online games in check."
　　Toebe also regularly visits a site where posters discuss Internet overuse. In August, when she first realized she had a problem, she posted a message on a Yahoo Internet addiction group with the subject line: "I have an Internet Addiction."
　　"I'm self-employed and need the Internet for my work, but I'm failing to accomplish my work,to take care of my home, to give attention to my children," she wrote in a message sent to the group."I have no money or insurance to get professional help; I can't even pay my mortgage (抵押贷款) and face losing everything."
　　Since then, Toebe said, she has kept her promise to herself to cut back on her Internet use. "I have a boyfriend now, and I'm not interested in online dating," she said by phone last week. "It's a lot better now."
　　注意：此部分试题请在答题卡1上作答。
　　1. What eventually made Carla Toebe realize she was spending too much time on the Internet?
　　A) Her daughter's repeated complaints.
　　B) Fatigue resulting from lack of slee