[解析]
(1)B.细节理解题.根据第一段you can also listen to replies your friends send about your workout posts from Facebook and Twitter while you walk你还可以边走边听朋友们回复你在Facebook和Twitter上发布的健身帖子.可知,使用者可以在运动中去听朋友们对你的留言.故选B.
(2)C.细节理解题.根据第三段Open up this free app(IOS or Google Play)and choose a charity.Start a workout,choosing walking,running,or cycling.For each completed mile,you'll have earned a donation for your chosen charity.打开此免费应用程序(IOS或Google Play)并选择一个慈善机构.开始一项锻炼,选择步行、跑步或骑自行车.每完成一英里,您将为您选择的慈善机构赢得一笔捐款.可知,使用者能在运动的同时为慈善筹集善款.故选C.
(3)A.文章出处题.根据全文可知,这篇文章介绍了几款运动应用程序,主要是围绕它们的各自特点展开的.故选A.