【题目】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（打瞌睡）—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（焦虑）.The study, by researchers from Seoul, South Korea, involved mice being fed with dried milk powder（奶粉） made from cows milked both during the day and at night. Those 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 cow milk harvested at different time has not been tested on humans up to now, taking melatonin drugs has been suggested to those who have trouble falling asleep at night.
Previous （以前的）studies have also showed that milk can be excellent for helping sleep because of the calcium content, which helps people to relax.
【1】According to the text, the mice fed with daytime milk_______.
A. started sleep more easily B. were more anxious
C. were less active D. woke up later
【2】Which of the following is true of melatonin according to the text?
A. It’s been tested on mice for ten years
B. It can make people more energetic
C. It exists in milk in great amount
D. It’s used in sleeping drugs
【3】What can be a suitable title for the text?
A. Night Milk and Sleep B. Fat Sugar and Health
C. An Experiment on Mice D. Milk Drinking and Health
【4】How does the author support the theme of the text?
A. By giving examples.
B. By stating arguments.
C. By explaining statistical data.
D. By providing research results.
【答案】
【1】B
【2】D
【3】A
【4】D
【解析】试题分析：本文讲述了晚上牛奶和睡眠的关系，晚上牛奶包含更多的褪黑激素，这种物质可以帮助睡眠。
【1】B 推理判断题。根据第四段第一句Those 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.可知，喂晚上牛奶的那些老鼠比喂白天牛奶的老鼠更不活跃，更不焦虑。故喂白天牛奶的老鼠更焦虑。故选B。
【2】D 推理判断题。根据第六段taking melatonin drugs has been suggested to those who are struggling to fall asleep at night. 可知，melatonin可以用于安眠药。故选D项。
【3】A 主旨大意题。综合全文可知，本文讲的是喝晚上牛奶和睡眠的关系，故A项符合题意。
【4】D 细节理解题。根据前三段But now a study has found it really does help people nod off—if it is milked from a cow at night.一项研究表明……；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.研究者已经发现晚上牛奶包含更多的褪黑激素，……； 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. 来自汉城的研究者……。故作者是通过提供研究结果来支持文章主题的。故选D。
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