[解析]
(1)C.细节理解题。根据Free Graphing Calculator App部分中The Free Graphing Calculator lets the user create up to four graphs atonce,and lets users adjust the graphs for the best views.( Free Graphing Calculator允许用户一次创建最多4个图表,并允许用户调整图表以获得最佳视图)可知,你可以使用Free Graphing Calculator应用程序来让图表更清晰。故选C.
(2)B.细节理解题。根据Quizlet部分中The app has a mix of text,images and audio recordings,including pronunciation of words indifferent languages.(该应用程序包含文本、图象和音频录音,包括不同语言单词的发音)可知,Quizlet应用程序可以用来读单词。故选B.
(3)D.细节理解题。根据Quizlet部分中Quizlet is available as a free app from Apple's iTunes store. (Quizlet是苹果iTunes商店的一款兔费应用程序);Free Graphing Calculator App部分中The Free Graphing Calculator is free. (Free Graphing Calculator是免费的)以及PomoDone App部分中The app is fre(该应用程序免费)可知,这三款应用程序的相同的特点在于他们都是免费用来帮助用户的。故选D.