题目

25℃时，下列各组离子在指定溶液中一定能大量共存的是( ) A.pH＝1的无色溶液中：Na＋、Cu2＋、Cl－、CO B.使酚酞呈红色的溶液中：K＋、Na＋、NO、Cl－ C.0.1mol·L－1的FeCl2溶液中：H＋、Al3＋、SO、ClO－ D.由水电离出的c(H＋)＝1×10－10mol·L－1的溶液中：Mg2＋、NH、SO、HCO 答案：B Mr．Smith didn't understand ________ made his son so upset that evening． [　　] A．what was it B．why it was this C．how that was D．what it was that