题目

  In the dining room of my grandfather’s house stood a massive grandfather clock. Meals in that dining room were a   36  for four generations to become one. The table was always   37  with food from wonderful family recipes（食谱）all containing   38  as the main ingredient（成分）. And always that grandfather clock stood like a trusted old family   39  , sharing our happiness.As I was a child, the old clock  40  me. I watched and listened to it during meals. I   41  how at different times of the day, that clock would strike with a wonderful   42  . Year after y设N^代表阿伏加德罗常数的值，下列说法正确的是                                                （    ）       A．在O2参与的反应中，1mol O2作氧化剂时得到的电子数一定是4N=       B．124g白磷分子中所含有共价键为6NA       C．标准状况下，22．4LCCl4中所含：有分子数为NA       D．电解精炼铜时转移了6．02×1023个电子，阳极溶解了32gCu