解析：选A　细节理解题。根据文章第三段中的“In teens, ...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。

　　12．According to AAPs 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。

　　D

　　(2016·石家庄高三质检一) Common Sense Media is a non­profit group in the United States that studies children’s use of media and technology. The group has done a survey asking teachers about the effects of their students’ use of entertainment media.

　　Entertainment media was defined as the TV shows, music, video games that students use for fun. Many teachers said they believe media use has hurt academic performance, which in some cases is already not very strong. Vicky Rideout wrote the report for Common Sense Media. “We have merely four in ten students feel poor at reading, at oral communication and more than that thing the students wrongly fear report writing. So we need to make sure that everything kids are doing is helping to accelerate progress and not preventing it.”

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