2. 外语
  3. Internet has long been the focus of research. Recently, a large study【C1】_____that otherwise healthy teenagers are much more【C2】

Internet has long been the focus of research. Recently, a large study【C1】_____that otherwise healthy teenagers are much more【C2】

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问题     Internet has long been the focus of research. Recently, a large study【C1】_____that otherwise healthy teenagers are much more【C2】_____to depression if they spend too much time【C3】_____the Internet.
    Researchers who【C4】_____more than 1 000 students at high schools in New York—all of them【C5】_____of anxiety and depression at the start of the study—found that after nine months,【C6】_____of severe depression among "pathological(病态的)" users were 2. 5 times【C7】_____of the others.
    The study was published on Aug. 2 in Archives of Pediatrics & Adolescent Medicine. It used self-rating scales to【C8】_____anxiety and depression in the process, along with an【C9】_____test that asks questions like " How often do you feel depressed,【C10】_____or nervous when you are offline, which goes away once you are【C11】_____online?"
    Of the 1 041 subjects, 94 percent were【C12】_____as normal Internet users and 6 percent as moderately pathological or【C13】_____severe risk for addiction. After nine months, 87 students, or 8. 4 percent, developed mild to【C14】_____depression.
    While depression is an established risk factor for【C15】_____Internet use, the study suggests the【C16】_____may also be true, said the lead author, Dr. Lawrence T. Lam, of the School of Medicine, Sydney, in Australia. He【C17】_____that users often went days or weeks【C18】_____enough sleep, which can【C19】_____to depression, and tended to react intensely【C20】_____the online game world.
    "Failure in the game-playing is as real as failure in other parts of their life," he said.
【C7】
选项 A、that
B、this
C、those
D、which
答案C
解析 代词辨析题。that和this一般指代单数概念，those一般指代复数概念，which一般表选择关系。根据句意可知，研究者发现病态的上网者严重消沉的几率是其他人的2．5倍。由此可知，这里表达的是复数概念“其他人”，故those符合句意。
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