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British psychologists have found evidence of a link between excessive Internet use and depression, a research has shown. Lee

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问题     British psychologists have found evidence of a link between excessive Internet use and depression, a research has shown.
    Leeds University researchers, writing in the Psyckopathology journal, said a small proportion of Internet users were classed as Internet addicts and that people in this group were more likely to be depressed than non-addicted users.
    The article on the relationship between excessive Internet use and depression, a questionnaire-based study of 1,319 young people and adults, used data gathered from respondents to links placed on UK-based social networking sites.
    The respondents answered questions about how much time they spent on the Internet and what they used it for: they also completed the Beck Depression Inventory—a series of questions designed to measure the severity of depression.
    The six-page report, by the university’s Institute of Psychological Sciences, said 18 of the people who completed the questionnaire were Internet addicts.
    "Our research indicates that excessive Internet use is associated with depression, but what we don’t know is which comes first—are depressed people drawn to the Internet or does the Internet cause depression?" the article’s lead author, Dr. Catriona Morrison, said. "What is clear is that, for a small part of people, excessive use of the Internet could be a warning signal for depressive tendencies."
    The age range of all respondents was between 16 and 51 years, with a mean age of 21.24. The mean age of the 18 Internet addicts, 13 of whom were males and five females, was 18.3 years. By comparing the scale of depression within this group to that within a group of 18 non-addicted Internet users, researchers found the Internet addicts had a higher incidence of moderate to severe depression than non-addicts. They also discovered that addicts spent proportionately more time browsing sexually pleasing websites, online gaming sites and online communities.
    "This study reinforces the public speculation(推测)that over-engaging in websites that serve to replace normal social function might be linked to psychological disorders like depression and addiction, Morrison said. "We now need to consider the wider societal implications of this relationship and establish clearly the effects of excessive Internet use on mental health."
What was collected as data by the researchers?
选项 A、The number of users of UK-based social networking sites.
B、Respondents’ visits to UK-based social networking sites.
C、Links on UK-based social networking sites.
D、Respondents’ answers to a questionnaire.
答案D
解析 原文该段中提到这个研究是a questionnaire-based study，这表明研究者的数据来自“问卷调查”。即受访者填在问卷上的回答就是研究依赖的数据，由此可见，本题应选D。
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