题目

完形填空  阅读短文，从每题所给选项中选出可以填入空白处的最佳选项When I was young，my father told me that little acts of kindness may give one great happiness. Since then I have always tried to help people in   1   .    One hot summer afternoon, I was   2   down the highway to New York when another car suddenly   3   into my lane(车道). My car was in the far right lane，so it ran onto the roadside. As a(n)   4   driver，I moved my car quickly and skillfully back onto the highway without causing any accident.     I was    5   with t用NA表示阿伏加德罗常数，下列叙述正确的是 A．46g乙醇中含有的化学键数为7NA B．1mol氯气和足量NaOH溶液反应转移电子数为2NA C．1molOH－和1mol–OH(羟基)中含有的质子数均为9NA D．10L0.1mol·L－1的Na2CO3溶液中，Na＋、CO32-总数为3NA