题目内容：
回答题：Whether you thinkyou need daytime rest or not, picking up a nap (午睡) habit is a smart, healthy move. The Mayo Clinic saysnaps 67 relaxation, better mood and alertness, and a sharper working 68 . A 2008 British study found that compared to getting more nighttime sleep,a mid-day nap was the best way to cope 69 the mid-afternoon sleepiness.
According to theHarvard Health Letter, several studies have shown that people 70 newinformation better when they take a nap shortly after learning it. And, most 71 ,a 2007 study of nearly 24,000 Greek adults in the Archives of Internal Medicinefound that people who napped 72 had a 37 percent reduced risk of dying 73 heart disease compared to people who didn't nap. Of course, nappingisn't 74 for everyone. If you're suffering from inability to sleep, naps that aretoo long or taken too late in the day can 75 with your ability to fall orstay asleep at night.
But for most, napscan make you feel sharper and happier. Naps provide different benefits 76 onhow long they are. A 20-minute nap will boost alertness and concentration; a90-minute snooze (小睡) can 77 creativity.
According toprevention. corn, you 78 a natural dip in body temperature 79 I p.m.and 3 p.m. A short nap at this time can boost alertness 80 several hoursand, for most people, shouldn't 81 being able to fall asleep at night.
Pick a dark, cozyplace that's not too warm or too chilly, prevention.corn 82 snapping onthe couch instead of in bed, so you're less 83 to snooze for too long.
Surprisingly, thebest place to take a nap may be a hammock (吊床．if you have one. A Swiss study 84 last year foundthat people fell asleep faster and had deeper sleep when they napped in ahammock than in a bed. That same rocking 85 that puts babies to sleep works 86 for grown-ups, too.
A．enforce
B．promote
C．operate
D．support
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