题目

向a mL0.25mol·L-1的AlCl3溶液中加入金属钠，反应完全后，恰好只形成NaCl和NaAlO2的混合溶液，则加入金属钠的物质的量为（    ） A．2.5a×10-4mol      B．a×10-3mol      C．7.5a×10-4mol      D．a×10-4mol 答案：BAfter ________ some complaints about the food, the manager decided to change the cooks.A.receiveB.receivingC.receivedD.to receive