假定你是李华。David是你的美国笔友。他对中国鼓励使用环保购物袋很感兴趣，来信向你询问此事。请你给他写封回信，主要内容如下：
1、感谢他的关注；
2、简要介绍相关情况；
3、谈谈你的感想。
注意：
1、词数100左右，信的格式已为你写好；
2、可根据内容要点适当增加细节，以使行文连贯；
3、参考词汇：环保购物袋---environment-friendly shopping bag
关 注 —concern
June 8
Dear David，
Yours,
Li Hua

Dear David, I’m glad that you've noticed our efforts directed towards environmental protection. Thank you for your concern. As too much use of plastic bags has caused serious white pollution, our govenment encourages us to use environment-friendly shopping bags. These bags are made of a variety of material that can be easily treated when they become rubbish. Besides, they can be reused. More and more people in China have realized the advantages of such bags and started using them. I believe that the wide use of these shopping bags can greatly improve our environment. This is one of the many steps we are to make our country an even cleaner place. Yours, Li Hua

亲爱的戴维，我很高兴你已经注意到我们的努力对环境保护的努力。谢谢您的关心。过多使用塑料袋已经造成了严重的白色污染，我们的政府鼓励我们使用环保购物袋。这些塑料袋是由各种材料制成的，它们可以在垃圾变成垃圾时容易处理。此外，他们可以重复使用。在中国，越来越多的人已经意识到了这些袋子的优点并开始使用它们。我相信这些购物袋的广泛应用可以大大改善我们的环境。这是我们为使我们的国家更清洁的地方之一。

你的，李华