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  3. A warm drink of milk before bed has long been the best choice for those wanting a good night’ s sleep. But now a study has found

A warm drink of milk before bed has long been the best choice for those wanting a good night’ s sleep. But now a study has found

admin2020-01-11  17
问题    A warm drink of milk before bed has long been the best choice for those wanting a good night’ s sleep. But now a study has found it really does help people nod off—if it is milked from a cow at night.
   Researchers have discovered that "night milk" contains more melatonin(褪黑激素) , which has been proven to help people feel sleepy and reduce anxiety.
   The study, by researchers from Seoul, South Korea, involved mice being fed with dried milk powder made from cows milked both during the day and at night.
   The mice given night milk, which contained 10 times the amount of melatonin, were less active and less anxious than those fed with the milk collected during daytime, according to the study published in The Journal of Medicinal Food.
   Night milk quickened the start of sleep and caused the mice to sleep longer.
   While the effect of cows’ milk harvested at different time has not been tested on humans up to now, taking melatonin drugs has been suggested to those who are struggling to fall asleep at night.
   Previous studies have also indicated that milk can be excellent for helping sleep because of the calcium content, which helps people to relax.
   Milk is also sugar-free and additive-free with nutritionists recommending skimmed milk as the best choice before bed as it is the least fattening. The more fat you take in before bedtime, the greater burden you will put on your body at night.
Which of the following is true of melatonin according to the text?
选项 A、It’s been tested on mice for ten times.
B、It can make people more energetic.
C、It exists in daytime milk in great amount.
D、It’s used in sleeping drugs.
答案D
解析 根据第四段“The mice given night milk,which contained 10 times the amount of melatonin…”可知，晚上收集的牛奶中褪黑激素含量是白天收集的牛奶的10倍，并没有说在老鼠身上用褪黑激素试验过10次，所以A项错误。根据第二段“…more melatonin，which has been proven to help people feel sleepy and reduce anxiety．”可知，褪黑激素在晚上收集的牛奶中含量更高，且会让人昏昏欲睡，而不是精力更加充沛，所以B、C两项错误。根据第六段“…taking melatonin drugs has been suggested…”可知，服用含褪黑激素的药可以帮助睡眠，由此可推知，褪黑激素被用在了安眠药中，所以D项正确。故选D。
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