问答题
If you are an English tour guide, your guests are from America, please write a passage according to the following demands:(not less than 300 words)
1) how can you express your warm welcome, namely, what to say when you meet your guests at the first time.
2) Please show them around one of the scenic spots of Beijing that they are very interested in, and introduce it to your guests simply.
3) At last, how can you do your farewell speech to your guests.