题目

 (07·辽宁) Lang Lang is a world-class young pianist who grew up in Shenyang. He went to a piano school in Beijing when he was just eight. “You need 36  his father said. “But if you don’t work hard, no fortune will come.” What made him sad was 37 his piano teacher in Beijing didn’t like him. “You have no talent. You will never be a pianist. 38 a nine-year-old boy Lang Lang was badly 39. He decided that he didn’t want to be a  40 any more. For the next two weeks he didn’t touch the piano 41  his father didn’t  push, but waited. Luckily, the day came when his tea下列说法中，错误的是（　　）A．浮在水面上的铁球，一定是空心的B．沉在水底的铁球，可能是空心的C．浮在水中的铁球，可能是空心的D．浮在水中的铁球，一定是空心的