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” has more melatonin(褪黑激素), which has been proven to help people feel sleepy and less worried.
In the study, mice were fed with dried milk powder made from cows milked both during the day and at night by researchers fron Seoul, South Korea.
Those given night milk, which had 10 times the amount of melatonin, were less active and less worried 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 milk harvested at different time has not been tested on humans up to now, taking melatonin medicine has been suggested to those who are trying to fall asleep at night.
Studies have also showed that milk can be excellent for helping sleep because there is calcium(钙) in it, which helps people to relax.
Milk is also sugar-free because it is the least fattening.   The more fat you take in before bedtime, the greater burden you will have on your body at night.
 根据上文内容判断正 (T) 误(F)
51. According to the passage, the mice fed with daytime milk were less active.
52. The study has been tested on mice for ten times.
53. People with sleeping problems have been advised to drink milk collected during the night by researchers.
54. Milk is good for sleep because there is meletonin and calcium in it.
55. The wrtier shows the main idea of the passage by giving examples.
【答案与解析】
【文章大意】文章主要讲了一项研究发现，如果是在晚上从奶牛身上挤奶，能帮助人们打瞌睡．科学家以老鼠进行实验发现，那些喝夜间牛奶的人比那些喝白天收集的牛奶的人更容易睡着．
51．F  【解析】内容理解题，根据Those given night milk， which had 10 times the amount of melatonin， were less active and less worried than those fed with the milk collected during daytime与那些白天喝牛奶的相比，那些喝了含有10倍褪黑激素的夜间牛奶的人不那么活跃，也不那么焦虑，可知喝夜间牛奶更加不活跃而不是喝日间牛奶，故填F。
52．F  【解析】内容理解题，根据Those given night milk， which had 10 times the amount of melatonin， were less active and less worried than those fed with the milk collected during daytime与那些白天喝牛奶的相比，那些喝了含有10倍褪黑激素的夜间牛奶的人不那么活跃，也不那么焦虑，可知不是在老鼠身上测试10次，故填F。
53．F  【解析】内容理解题，根据While the effect of milk harvested at different time has not been tested on humans up to now， taking melatonin medicine has been suggested to those who are trying to fall asleep at night虽然到目前为止不同时间收获的牛奶对人类的影响还没有被测试过，但是已经有人建议那些晚上试图入睡的人服用褪黑激素药物，可知是建议那些晚上试图入睡的人服用褪黑激素药物，故填F。
54．T  【解析】内容理解题，根据Researchers have discovered that" night milk" has more melatonin研究人员发现，"夜间牛奶"含有更多褪黑激素和Studies have also showed that milk can be excellent for helping sleep because there is calcium in it研究还表明，牛奶有助于睡眠，因为它含有钙，可知牛奶有助于睡眠，因为它含有钙和褪黑激素，故填T。
55．F  【解析】内容理解题，根据But now a study has found it really does help people nod off- if it is milked from a cow at night但是现在一项研究发现，如果它是在晚上从奶牛身上挤奶，它确实能帮助人们打瞌睡，联系文章内容，可知文章主要是通过提供研究内容来支撑文章观点的，故填F。