假定你是某国际学校高中生大明，最近你发现你校图书馆阅览室中存在高声喧哗和乱丢垃圾的现象。请用英语给馆长Mr.Smith写一封信，要点如下：
1.说明写信目的；2.提出合理建议。
注意：1.词数100左右；
2.可适当增加细节，以使行文连贯；3.信的开头和结尾已给出，但不计入总词数。
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【考点】提纲作文．

【答案】Dear Mr.Smith，
I am Daming，a student from Class Five，Senior Two.I am writing to draw your attention to two improper behaviors among students in the reading rooms of the school library：making noises and littering.As you know，it is difficult for readers to focus while some students are whispering to each other or making cell phone calls.Besides，a dirty environment is not only bad for our health but also has a negative effect on our studying.
Therefore，in my opinion，some measures should be taken to solve these problems.First，put up some signs which forbid such improper behaviors.Second，ask all the students to pick up their rubbish when they leave.
Thank you for your consideration.
Yours，
Li Hua