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  3. In a new【C1】________published in the journal Heart, researchers found that Swiss adults who took one or two daytime naps per wee

In a new【C1】________published in the journal Heart, researchers found that Swiss adults who took one or two daytime naps per wee

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问题     In a new【C1】________published in the journal Heart, researchers found that Swiss adults who took one or two daytime naps per week had a lower【C2】________of heart problems, including heart disease and strokes, than non-nappers.【C3】________inadequate sleep is a known risk factor for a host of health problems, including cardiovascular issues, naps’【C4】________to replace lost nighttime sleep could make them a【C5】________habit.
    Almost 3,500 Swiss adults aged 35 to 75 took part in the study. They provided 【C6】________information about their napping habits, nighttime sleep, demographics and lifestyle information, and underwent a range of medical tests【C7】________to assess their overall health. More than half of participants said they hadn’t napped during the week【C8】________the study began. Of the nappers, 667 said they had taken one or two, 411 said they had taken three to five and 370 said they had taken six to seven naps.
    During up【C9】________eight years of follow-up, 155 people had a heart problem. The researchers found that people who took one or two daytime naps per week had a lower risk of cardiovascular issues than non-nappers, even after adjusting for excessive daytime sleepiness,【C10】________can be a symptom of【C11】________health issues, nighttime sleep duration and demographic and lifestyle factors. The【C12】________between more frequent naps and heart health was not as strong.
    These short naps could be a valuable way to relieve stress and【C13】________inadequate sleep at night,【C14】________protecting heart health, the paper says. Sleep【C15】________is a known risk factor for conditions including obesity, diabetes, high blood pressure, stroke, heart disease and mental distress, according to the U. S. Centers for Disease Control and Prevention. So naps could help the【C16】________one-third of Americans who don’t get the recommended【C17】________seven hours of rest per night.
    【C18】________is the ideal nap?【C19】________the new study didn’t answer that question, most experts say a 20-minute nap is enough to reap【C20】________including better alertness, performance and mood.
【C3】
选项 A、Though
B、So
C、Since
D、If
答案C
解析 Since。本题考查连词辨析。四个选项分别为A项Though“虽然”；B项so“所以”；C项since“既然”；D项If“如果”。空格所在句意为“睡眠不足是许多健康问题(包括心血管问题)的已知风险因素，小睡补偿缺失的夜间睡眠，从而成为一种习惯”。前半句描述了一个人人皆知的事实，也是后半句的原因，故本题答案为C项。
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