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假定你是李華，你的美國朋友Jack來信說，他暑假后將到北京大學留學。請你根據(jù)以下內容給他寫一封回信，告知相關情況。

1.簡單介紹北京大學；

2.簡單介紹北京（例如生活便利，居民友善等）；

3.留學期間愿意提供任何幫助。

注意：1.詞數(shù)100左右：2.可以適當增加細節(jié)，以使行文連貫。

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