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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