假设你是李华，你在读美国中学生Jack的博客时了解到他即将作为一名交换生来北京学习，希望能够寄宿在一名擅长英语的中学生家里，以便更好地了解中国文化。请根据以下要点给Jack写一封电子邮件：
1．欢迎他来中国学习；  
2．介绍你个人情况；   
3．邀请他住在你家并愿意为他提供帮助。
注意：l．词数120—150；2．可适当增加细节，以使行文连贯。
                                                                               
                                                                               
                                                                               
                                                                               
                                                                               
                                                                               
                                                                               
                                                                               
                                                                               
                                                                               
                                                                                

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知识点： 读写任务作文