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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】________for 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 连词辨析题。A项Though虽然；B项So所以；C项Since既然；D项If如果。通过分析本句话“________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，小睡取代失去的夜间睡眠的________可以使它们成为一种________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。因此本题选择C项Since。注意：Since如果译为“自从”，其主句需要用现在完成时，时间状语从句则需要用一般过去时或Since之后要接表示过去的时间状语，而这句话不符合该特征。
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