填空题

Questions 47 to 51 are based on the following passage.
Leeds University study finds people classified as Internet addicts are more likely to be depressed than non-addictedusers. British psychologists have found evidence of a link between excessive Internet use and depression. Leeds University researchers, writing in the Psychopathology 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 was a questionnaire-based study of1,319 young people and adults. 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 report, by the university’s Institute of Psychological Sciences, said 18 of the people who completed thequestionnaire-1.4% of the total-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 subset 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 18Internet addicts,13 of whom were male and five female, was 18. 3 years. By comparing the scale of depression within this group to that within a group of 18 non-addicted Internet users-again of a mean age of 18. 3 years and made up of 13males and five females-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 gratifying websites, online gaming sites and online communities. "This study reinforces the public speculation 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. \
The research proved the relationship of excessive Internet use with depression, but researchers still wonder______.