题目

In 1973, I was teaching elementary school. Each day, 27 kids ___21___ “The Thinking Laboratory.” That was the ___22___ students voted for after deciding that “Room 104” was too ___23___. Freddy was an average ___24___, but not an average person. He had the rare balance of fun and compassion（同情）. He would ___25___ the loudest over fun and be the saddest over anyone’s ___26___. Before the school year ___27___, I gave the kids a special  ___28___, T-shirts with the words “Verbs Are Your  ___29___” on them. I had advised the kids that while verbs（动词）己知：HCN（aq）与NaOH（aq）反应的△H=-12.1kJ/moL；HCl（aq）与NaOH（aq）反应的△H=-55.6kJ/moL．则HCN在水溶液中电离的△H等于（ ）A．-67.7kJ/moLB．-43.5kJ/moLC．+43.5kJ/moLD．+67.7kJ/moL