题目

 I wanted to know _________, but no one would like to tell me.    A. what did the old man say    B. how did the old man come    C. whether the old man would come    D. who the old man went     答案：C   7．下列化学用语的使用正确的是（　　）A．氯化氢的电子式为：B．重氢负离子（${\;}_{1}^{2}$H-）的结构示意图为  C．次氯酸的结构式为H-Cl-OD．氯化钠的分子式：NaCl