公共场所常用的泡沫灭火器是用硫酸铝和碳酸氢钠两种溶液反应来产生CO₂，同时还产生硫酸钠和一种白色沉淀（氢氧化铝）．该反应的化学方程式______．

During 2007, Big 4 Company’ s warehouse was totally destroyed by a tornado. Tornados are very rare in the region where Big 4 is located. The book value of the warehouse at the time of the tornado was 10 million and Big 4 is self-insured. In addition, on June 30, 2007, Big 4 acquired one of its major suppliers. The fair value of the net assets acquired by Big 4 was greater than the purchase price. According to International Financial Reporting Standards, should Big 4 recognize an extraordinary item for tornado damage and should Big 4 recognize negative goodwill on its balance sheet due to the acquisitionExtraordinary lossNegative goodwill（）①A.NoYes ②B. Yes No ③C.NoNo

A. ①

B. ②

C. ③