C. were less active

　　D. woke up later

　　13. 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

　　14. 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

　　15.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】12.B

　　13.D

　　14.A

　　15.D

　　14.A主旨大意题。根据第二段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，这已经被证明能帮助人们感到困倦和减少焦虑。可知A项符合题意。

　　15.D推理判断题。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----。可知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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