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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.
【C8】
选项 A、before
B、after
C、when
D、since
答案A
解析 连词辨析题。四个选项分别为A项before“在……之前”；B项after“在……之后”；C项when“当”；D项since“自从”。空格所在句的后一句提及参与者不同程度的小睡，并且小睡的人数相对于总人数较少。故可以判断，大多数参与者在参加该研究之前从没有小睡的经历。选项B项完全相反，故排除。如果用C项when，则主句不能用过去完成时。而D项since意为 “自从”，有严格的时态要求，主句必须用现在完成时态，故排除。因此本题选择A项。
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