题目

The old mother was        to see her son off at the train station. A．more than a little sad                                  B．sad more than a little C．a little more than sad                                  D．a little more sad than 答案：A将106 g的Na2CO3和84 g NaHCO3先经充分强热后，再分别足量的盐酸反应，下列说法错误的是(　　)A.消耗盐酸一样多B.放出CO2的总量一样多C.后者生成的NaCl是前者的一半D.后者消耗盐酸是前者的一半