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  3. Researchers, writing in the journal Heart, pooled data from 23 studies and found that social isolation or feelings of loneliness

Researchers, writing in the journal Heart, pooled data from 23 studies and found that social isolation or feelings of loneliness

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问题     Researchers, writing in the journal Heart, pooled data from 23 studies and found that social isolation or feelings of loneliness were tied to an increased risk for coronary heart disease (冠心病 ) and strokes.
    The studies included data from 181,006 men and women ages 18 and over. There were 4,628 coronary events and 3,002 strokes in follow-up periods     【C1】________from three to 21 years. Three of the papers【C2】________ loneliness, 18 looked at social isolation and two included both. Social isolation and loneliness were determined with questionnaires; the researchers depended on medical records and death【C3】________for determining coronary events and strokes.
    The scientists found that loneliness and social isolation increased the     【C4】________risk of having a heart attack or a death from heart disease by 29 percent, and the risk of stroke by 32 percent. There were no【C5】________between men and women.
    "People have tended to focus from a policy point of view on【C6】________     lonely people to make them more【C7】________," said the lead author, Nicole K. Valtorta, a research fellow at the University of York in England. "Our study【C8】________that if this is a risk factor, then we should be trying to prevent the risk factor in the first place."
    The authors【C9】________that this was a review of observational studies and did not【C10】________cause and effect.
    A) acknowledge    E) differences    I) narrow     M) relative
    B) certificates   F) establish      J) permanent  N) submitting
    C) connected      G) formats        K) produces   O) targeting
    D) demonstrates   H) measured       L) ranging
【C8】
选项
答案D
解析 空格位于主语our study和that引导的宾语从句之间，故空格处应填入动词作谓语。空格所在句子是直接引语，为一般现在时，且主语为第三人称单数our study，因此动词的形式应为第三人称单数。由下文的宾语从句“如果这是一个风险因素，那么我们首先应该努力预防这个风险因素”可知，这正是主语our study说明的内容，词库动词中的demonstrates“证明，说明”填入空格，符合此处语境，故选D。
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大学英语四级

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