第二节: 书面表达（共25分）
张林是上海世博会的一名志愿者，以下是他做志愿者的理由。请你根据下图所示写一篇100字左右的短文，并表达你的看法。
参考词汇：上海世博会：Shanghai World Exposition 美德： virtue
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Zhang Lin is one of the volunteers serving in Shanghai World Exposition. The reasons for him to do so are as follows.
First of all, it’s a good virtue to help others. He was once helped by others so he wants to do something useful in return. Secondly, by helping others he has gained valuable experience and has built up his confidence. What’s more, volunteering makes his life more colorful and more meaningful.
As far as I’m concerned, it’s the volunteers who make Shanghai World Exposition a great success. So I’d like to be one of them to help visitors and I hope I can improve myself through serving others.