题目

阅读短文，回答下列问题。 I lost my red schoolbag in our library. My key is in it. I must find it. Please call me at 6755321. Thank you. Jason, Class 332 Brandy found a white watch under a desk in his classroom. Is it yours? Please ask Mr. Hanson for it. His telephone number is 8974588. Class 213 Alan, your baseball is on the table of our computer room. We found it under the bookcase. Please call 2315649 to get it.Computer Room Where is my pencil box? It's green. A black pen and an ID card are in it. I'm in Class 234. My phone number is 3541679. Please call m下列离子方程式正确的是（　　）A．碳酸钙与稀HNO3：CO32-+2H+=CO2↑+H2OB．Cu与AgNO3溶液：Cu+2Ag+=Cu2++2AgC．Fe与稀H2SO4：2Fe+6H+=2Fe3++3H2↑D．Ba（OH）2与稀H2SO4：Ba2++SO42-=BaSO4↓