题目：
下列反应的离子方程式正确的是[ ]
A．铝片跟氢氧化钠溶液反应：Al+2OH-==== AlO2-+H2↑
B．硫酸镁溶液跟氢氧化钡溶液反应：SO42- + Ba2+ ====BaSO4↓
C．碳酸钙跟醋酸反应：CaCO3+2CH3COOH====Ca2++2CH3COO-+H2O+CO2↑
D．铜片跟稀硝酸反应Cu+NO3-+4H+====Cu2++NO↑+2H2O
答案：
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