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  3. Going hungry is a major contributor to ill health, particularly among children, and a new report reveals how long-lasting the da

Going hungry is a major contributor to ill health, particularly among children, and a new report reveals how long-lasting the da

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问题     Going hungry is a major contributor to ill health, particularly among children, and a new report reveals how long-lasting the damage can be.
    Researchers at the National Cancer Institute (NCI) and the University of Calgary performed the first long-term study on the【C1】________of hunger on general health,【C2】________children from birth to 21 years. Most studies to date have【C3】________only snapshots of childhood health,【C4】________the short-term impact of hunger【C5】________a period of time.
    In the new analysis, the scientists found that children who went hungry at least once in their lives were 21/2 times more likely to have【C6】________overall health 10 to 15 years later, compared with those who never had to【C7】________food. "Our research shows that hunger and food insecurity are really damaging【C8】________children’s life chances," says lead author Sharon Kirkpatrick, a visiting fellow at NCI.
    The study supports earlier findings that【C9】________episodes of hunger are more likely to cause ill health than an isolated experience of starvation: children in Kirkpatrick’s analysis who experienced two or more periods of hunger were more than four times as likely to report ill health than those who never went hungry. The relationship, she says, remained strong even after the team accounted【C10】________other factors that could influence health, such as age, sex and household characteristics like income.
    【C11】________one experience of hunger can have lasting effects on a child’s health, a fact that is especially troubling in light of the sobering rise in U.S. households that were【C12】________to do without food in 2008: 15% of American families reported some【C13】________in the amount or quality of food they consumed,【C14】________from 11% the previous year.
    【C15】________this study did not probe into the【C16】________mechanism by which hunger affects long-term health, Kirkpatrick【C17】________that both psychological and physiological factors may be at work. Aside from the obvious negative impact that missing key nutrients and calories can have on growth and development, she says, the psychological【C18】________of food insecurity—not being able to afford a【C19】________and high-quality source of food—can be【C20】________to youngsters as well.
【C15】
选项 A、Once
B、If
C、While
D、Unless
答案C
解析 前半句指出这项研究没有做深入的研究，后半句指出科克帕垂克认为心理和生理双重因素都在起作用。前后含有让步关系，选C项While“虽然”。A项Once“一旦”，用于连接时间状语从句。B项If“如果”，引导条件从句。D项Unless“如果不……”引导一个否定意义的条件句。
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