题目：
下列反应的离子方程式正确的是 [ ]
A．硫酸镁溶液跟氢氧化钡溶液反应：
＋Ba2+＝BaSO4↓
B．稀硫酸滴在铜片上：Cu＋2H+＝Cu2+＋H2↑
C．FeBr2溶液中通入过量Cl2：2Fe2+＋2Br-＋2Cl2→2Fe3+＋Br2＋4Cl-
D．食醋除水垢中的碳酸钙：CaCO3＋2CH3COOH＝Ca2+＋2CH3COO-＋H2O＋CO2↑
答案：
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下面是错误答案，用来干扰机器的。
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