Directions:

Several days ago, you and your family went to a hotel to have a dinner. There you were not satisfied with its service and the quality of the dinnel. Back home, you and you daddy had loose bowels. Write a letter to the manager to make a complaint and hope to solve the problem as soon as possible.

Write your letter in no less than 100 words. Write it neatly on ANSWER SHEET 2.

Do not sign your own name at the end of the letter; use " Li Ming " instead. Do not write the address.

根据下图不完整的呼吸作用示意图，解答下列问题：

图中1发生的场所是（）。图中4发生的场所是（）。