21世纪报有个《心情巧克力》栏目，专门解答中学生的烦恼问题，栏目作家Meghan近来收到一封来信，请你根据这封来信的内容，并替Meghan写一封回信。
Dear Meghan:
I am really angry with my parents recently. Next Sunday is my birthday. My parents promised to buy a cell phone for me as my birthday present this year. But now when I ask about the birthday present they say they have changed their ideas, because they worry about my study if I get a new cell phone since the final exam is coming soon. They say a cell phone may take up too much of my time. But I think I can control myself, they just don't believe me. What's more, they broke their promise!
Liu Yang
请你根据来信内容，写一封回信。回信内容要求:
1) 理解父母亲的良苦用心:。他们出发点一定是为你好的。临近毕业，学业为重。
2) 手机的确有很多好处，比如：查字典，听音乐，查资料……但是也有不少危害，如使用不当，的确影响学习和生活。
3) 注意：以上信息不能遗漏，并适当发挥。但不要逐条翻译中文提示。文章不能少于100个单词。
Dear Liu Yang
……
