3.The teens go to sleep later than before because ________.
A.melatonin is secreted much later
B.melatonin regulates the sleep time
C.they sleep a lot in the daytime
D.they need to finish their homework
解析:选A 细节理解题。根据文章第三段中的“In teens, melatonin is secreted much later in the evening and continues to increase throughout the night.”可知,孩子们睡觉晚是由褪黑激素分泌晚造成的,故A项正确。
4.According to AAP's recommendation, middle and high schools should ________.
A.let teens sleep in the day
B.let the students be active
C.delay the start time
D.start later at 8 am
解析:选C 细节理解题。根据文章最后一段的倒数第二句话可知,APP建议初中和高中上午上课的时间应该推迟,故C项正确。
B
(2016·沈阳市高三质检)
Big messaging apps abroad
While WeChat is China's biggest mobile messaging app (应用软件), there are many equivalent apps in other countries that offer similar features.
WhatsApp (US)
Users: more than 300 million
Platforms: Android, iOS, Windows Phone, BlackBerry
Features: text chats, pushtotalk, file sharing, location sharing
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