The children often play soccer in the garden(花园). Sometimes they break (打破).Mrs. Smith’s windows.  
One afternoon , Mrs. Smith is reading a newspaper at home. After a short time, she closes her eyes and goes to sleep. At that time a little boy knocks(敲) at the door. Mrs. Smith opens the door and asks, “Do you break my windows again（又一次）?” “Oh, no”, says the boy. “ Your windows are open this time and our soccer is in your room. Can I get it back, please?” 
根据短文内容，选择正确答案。

现有下列物质：熟石灰、碳酸钠、氯化钠、碳酸钙、碳酸氢钠、氢氧化铝、稀盐酸等，在生产、生活中有广泛的用途．请按下列要求填空：

①农业中用来降低土壤酸性，改良土壤结构的是____ ；②可治疗胃酸过多的是____ ；③用于造纸、玻璃、印染、洗涤剂的是____；④用于维持人体正常生理活动的是____ ；⑤天安门前的汉白玉华表的主要成分是____ ；⑥可消除公路积雪的盐____．

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