在下面所举的人或物体中，没有受到浮力的是（　　）

中国大力贯彻落实创新、协调、绿色、开放、共享的发展理念，深入实施创新驱动发展战略，广泛开展大众创业、万众创新，着力培育新动能、改造提升传统动能。这表明（   ）

    Last month the manager of a jewelry shop (珠宝店) received a letter. As he was very busy then, the letter lay on his desk till tea-time. He opened it and a 10-pound note(票) fell out onto the desk. Within the note was a letter which said:
Dear sir:
    In 1935 I got engaged(订婚). But unfortunately I lost my job. At the time a lot of people were out of work. Six months later I got a job again, but of course I was very short of money. I came to your shop to buy a wedding ring(婚戒). The assistant took out some rings for me to look at, but she was called away for a moment, and I put one of the rings in my pocket. When she came back, I said I didn't know the size of my girl's finger. So I left the shop without buying a ring. My wife died a short while ago and the fact that I never paid for the ring has been heavy in my heart all these years. At that time, the ring cost 2 pounds so I think it is 10 pounds at today's price and I'm sending 10 pounds.

Yours truly,
A customer (顾客)

开头为什么这样称呼“聪，亲爱的孩子”？