阅读下面的书信, 然后按照要求写一篇150词左右的英语短文.
Dear David,
I am writing you this email because you're so busy every day with your studies and afterschool activities that we seldom have chances to talk facetoface.There is something that I am very worried about.
You have always been an active boy, willing to help others and always looking for an opportunity to
try something new or learn something different.I think these are wonderful qualities but I am concerned that they may be affecting your studies.In the past three months alone you have joined at least four different
student clubs.I see these activities taking up more and more of your time.You're always discussing
something with your classmates or surfing online.You're also devoting less time to homework and even
your teachers say you are looking very sleepy in class.
I know that these kinds of activities are fun and can help your development, but I think they have
started to damage your performance at school.Please remember the most important thing at this stage of
your life is your studies.Right now you should do your best in your examinations as it will give you more
choices in your future.I beg you to focus on your main goal and not to throw away all your years of hard
work.
Your loving mother
【写作内容】
假设你是信中的David，请用英语给你妈妈写回信。以下是回信的内容(信的开头和结尾已经为你写好)：
1. 以约30词概括书信的主要内容。
2. 以约120词谈谈你对参加学校社团或俱乐部活动的看法， 内容包括：
(1) 你读信后的感受；
(2) 你是否赞成你妈妈的观点， 并陈述理由；
(3) 你对你妈妈的承诺。
【写作要求】
1. 作文中可以使用亲身经历或虚构的故事，也可以参照阅读材料的内容，但不得直接引用原文中的句子。
2. 作文中不能出现真实姓名和学校名称。
【评分标准】
概括准确，语言规范，内容合适，语篇连贯。
Dear Mom,
_____________________________________________________________________________
________________________________________________________________________________
Yours,
David
类药物治疗，应告知患者（）