假定你是李華，David 是你的美國筆友。他對中國鼓勵使用環保購物袋很感興趣，來信向你詢問此事。請你給他寫封回信。主要內容如下：

　　 感謝他的關注。

　　 簡要介紹相關情況。

　　 談談你的感想。

　　注意：

　　1. 詞數100左右，信的格式已為你寫好。

　　2. 可根據內容要點適當增加細節，以使行文連貫。

　　3. 參考詞匯：環保購物袋---environment-friendly shopping bag; 關注---concern.

　　[范文]

　　Dear David,

　　Im glad that youve 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