【参考范文】 This pie chart above shows us clearly the results of a survey about the students’ reading purposes through smart-phone in a certain university. As we can see clearly in the pie chart mentioned above, the students using smart-phones to obtain knowledge account for 60%. The number of the ones who use it to kill time ranks the second, taking up 21%. What comes next of the purpose is to get information, with a percentage of 17% . And the rest are for other purposes. How is this phenomenon is caused? The following factors may explain it. To begin with, the popularization of smart-phone all over China and the policy of encouraging online education make open resources of knowledge possible for the masses in both urban and rural areas. Students can acquire the knowledge they are interested in regardless of their majors anytime anywhere. In addition, students would like to use smart-phones for leisure besides learning since there emerges so many online games and social media. Lastly, students need to keep themselves updated to the rapidly changing world to make decisions, for example, the decision to choose major and career path. And smart-phone is no doubt the easiest way to help students stay informed about the important news. Firmly，I reckon there is no need to worry about this trend in smart-phone use. Moreover, schools and governments should provide more versatile open online courses to capitalize the merits of smart-phone while pose some strict policies and regulations on the spread of fake and bad information which may cause negative effects on students’ mind.