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

　　With more than 300 million active users, WhatsApp is one of WeChat's biggest competitors. Developed by two ex­Yahoo employees in 2009, WhatsApp originally focused on text chats, but on Aug. 6 it also started push­to­talk service. It's noted for its accessibility, ease of use and the absence (没有) of adverts. The service is free for the first year, after which D|S0.99 (6.06 yuan) is charged for a one­year subscription.

　　Kakao Talk (South Korea)

　　Users: more than 100 million

　　Platforms: Android, iOS, Windows Phone, BlackBerry and Bada (an operating system developed by Samsung)

　　Features: text chats, group chats, push­to­talk, group calls, file sharing

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