题目

He looked calm before the competition, but i________, he was very nervous. 答案：indeed含等物质的量NaOH的溶液分别用pH为2和3的溶液中和，设消耗溶液的体积依次为，，则两者的关系正确的是（  ） A．＞ B．＝ C．＜ D．＞