读长江水系图及相关材料，回答下列问题．

黄埔军校的校门上有“升官发财请往他处，贪生畏死勿入斯门”的对联，在发生了一个事件之后，有人将对联中的“请”和“勿”进行了调换，你认为这一事件应是(    )       

National Day is a big ________ in China.

— Look, she is our new doctor.            

— No, I don't.                   

    Ann was ill. She went to see a doctor. The doctor asked her to1her tongue (舌头), and then he said,  "OK. You can put your tongue back now. There's2wrong with you, but I'm afraid you have a problem, you never do3"

    "But, doctor," Ann said, "I don't think so."

    "Don't4me what you think," the doctor said, "I see a lot of people5you. None of them get any exercise. They sit in offices all day and in front of the TV in the evening. You must walk quickly for at least 20 minutes a day."

    "Doctor, you don't understand," Ann said, "I take enough exercise every day."

    "I don't want to6any excuses," the doctor said, "You must spend time 7 exercise, if you don't, you will get8 and have health problems."

    "But I walk every day." Ann said.

    "Oh, yes, and I know what kind of walking that is. You walk9meters to the bus stop from your house, from the bus stop to your office, and from your office to your dining-room for lunch and back. That's not a real walk. I'm talking about a walk by the lake or in the park for 20 minutes every day."

    "Would you please 10  me, doctor?" Ann said,   "I'm a postwoman. I walk for nearly seven hours every day."

    For a moment the doctor was silent, then he said, "Can I see your tongue again?"