下列有关实验的操作、原理和现象，正确的是（ ）
| A．吸滤操作可加快过滤速度，若吸滤完毕，则应先关闭水龙头，然后拆下连接抽气泵和吸滤液的橡皮管 | |
| B．某无色溶液中滴加硝酸银溶液，有白色沉淀生成， 加稀硝酸后沉淀溶解；若另取该溶液加稀硫酸后，微热后有气泡产生；可确定该溶液中一定含NO2- | C．在纸层析法分离Fe3+和Cu2+的实验中，层析后，经氨熏，滤纸中无色带出现，一定是误将试样点浸没在展开试中 |
| D．结晶时，若沉淀的结晶颗粒较大，静置后容易沉降到容器底部，此时，进行分离的操作方法是倾析 |
答案：D
根据短文内容，完成表格，每空一词。 What is your favourite cartoon? It may be difficult for you to decide. But for pianist Lang Lang, Tom and Jerry is the best one. When Lang Lang was two years old, he saw Tom playing the piano. This was his first time to enjoy western music and this experience encouraged him to learn to play the piano. His talent at the keyboard has taken him from Shenyang to the world. Lang became a good piano student at three. Ever since, the boy has been doing better and better. In 1997, the 15-year-old boy studied at a famous American music college. Lang’s performance are full of energy. He is well-known for making facial expressions and moving around while playing the piano. The road to success has never been easy. Lang’s father stopped his job to look after him, while his mother stayed in Shenyang to make money. But Lang considers himself lucky and believes he should give something back. He has helped the children in poor areas a lot.
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