第二节书面表达（满分25分）
课外锻炼可以帮助我们消除紧张学习后的疲劳，有利于提高学习效率。而你所在的班有的同学参加课外锻炼后却愈加疲劳，上课时常打瞌睡。假如你是李华，请根据这一现象用英语给编辑部写一封信，谈谈你对这一现象的看法。短文须包括以下内容：
为了强健身体，同时有效地促进学习，中学生应加强课外锻炼；
应选择适合自己身体素质的体育项目，强度不能太大；
每天半个小时只一个小时为宜。
注意：（1）不要逐字翻译，可适当增加细节；
（2）词数：100左右
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One possible version：
As we all know ，physical exercise after class can help us remove tiredness ，and is helpful to our studies 。however ，some students in our class have been feeling even more tired after physical exercise and often fall asleep in class。
In my opinion ，it isnecessary and important for students to have some exercise ，but we should choose proper sport events and avoid taking part in any extreme or even dangerous events such as mountain-climbing after class and on weekends 。besides ，physical exercise shouldn’t last too long。Half an hour to one hour is ok，I think 。otherwise ，it will make one even more tired after having an extreme sport event for a long time 。do you think so？
Looking forward to your advice 。
Yours faithfully ，
Lihua