假如你是李华，现任你们学校的学生会主席。你将代表学生会起草一份倡议书，号召全校同学行动起来，为环保运动做出自己的努力。同时下周六学校将组织同学 在全市进行环保宣传活动，征召志愿者到校学生会报名。
注意：(1)短文应该包括以上所提供的主要信息，可适当发挥;(2)词数：120左右;(3)倡议书格式以提供，不计入总词数;(4)参考词汇：征召(新人) recruit。
15 May, 20xx
Dear brothers and sisters,___________________________________________________________________________
__________________________________________________________________________________
Yours sincerely,
Li Hua
University Students' Union
【猜题理由】随着经济的高速发展，社会自然环境遭受严重污染。环保意识的培养和环保工作的开展成为国人，乃至世人共同关注的热点和焦点。对环保问题而言，"只要人人献出一点爱，世界将 变成美好人间 !"此话题为学生熟知，与高中生的生活实际贴近，而且具有一定的开放性，使得每个学生都能够有话可说，符合新课标理念下的命题方向。
【构思点拨】首先简要介绍环保问题之重要，号召同学们行动起来，共同参与环保活动;其次就环保发出倡议，并征召志愿者。这样既把考生限定在一定范围之内，又给予了考生相当的发挥的自由，有助于考生的作文脱颖而出。
【参考范文】
15 May, 20xx
Dear brothers and sisters,
Oh behalf of the University Students' Union, I, the Chairman of the Union , am earnestly calling for yo ur active participation in our environmental protection campai gn. It is the duty of every global villager; man just can not sustain his glorious c i vilization without a rewarding environment, which will be possible only if man makes considerable efforts to protect the environment.
Do you cherish precio us opportunities to volunteer in our joint efforts in environmental protection? Here is a great one not to be missed by any enthusiastic youth; Right next Saturday, our university is to run a publicity campaign to advocate environmental protection across the city. The University Students' Union will be in charge of recruitment of volunteers. Let's join our h ands and take action immediately.
Yours sincerely,
Li Hua
Univers