题目

下列实验可行的是 A．用澄清石灰水检验CO中含有的CO2 B．用BaCl2 除去NaOH溶液中混有的少量Na2SO4 C．用KSCN溶液检验溶液中含有的Fe2+ D．用溶解、过滤的方法分离CaCl2 和NaCl固体混合物 答案：A---What did your granddaughter say just now?--- She wondered ___________．A．what time was itB．whether the book was written by Mark TwainC．how could she use the MP4D．when she will have a final test