如图是制作人的口腔上皮细胞临时装片操作步骤示意图，请分析回答：（内填图中序号）

根据材料内容，选择正确答案。

    Mr Smith had a week's holiday, so he said, "I'm going to see the sea by train." He put on his best clothes, took a small bag, went to the railway station and got onto the train. He wore a beautiful hat, and he often put his head out of the window during the trip and looked at the beautiful scenery. But suddenly the wind pulled his hat off.

    Mr Smith took his old bag and threw it out of the window quickly too. The others in the train laughed. "Is your bag going to bring back your beautiful hat?" they asked.

    "N0," Mr Smith answered, "but there is no name or address in my hat, and there's a name and an address on the bag. If someone finds both of them, he or she will send me the bag and the hat.''

如图，一幢大楼的顶部竖有一块写有“校训”的宣传牌CD．小明在山坡的底部A处测得宣传牌底部D的仰角为60°，沿山坡向上走到B处测得宣传牌顶部C的仰角为45°．已知山坡AB垂直于视线AD，AB=20米，AE=30米，则这块宣传牌CD的高度为____．（测角器的高度忽略不计，结果精确到0.1米．参考数据：$\sqrt{2}$≈1.414，$\sqrt{3}$≈1.732）

   Sunday 1 the favorite day for our family. My parents 2  not 3 work. My sister and I 4 go to school. We 5 at home and 6 in the morning. In the afternoon, my sister and I 7 out to buy some different things. My sister likes songs. She 8 new tapes. I buy story books, a frisky, a kite and things 9 that. We also buy some small gifts (礼物) for our parents. We 10 them. They love us very much. We live in a happy family.