题目

  I was a single parent of four small children, working at a low-paid job. Money was always tight, but we had a   36   over our heads, food on the table, clothes on our backs, and if not a lot, always   37  . Not knowing we were poor, my kids just thought I was   38  . I’ve always been glad about that.        It was Christmas time, and although there wasn’t   39   for a lot of gifts, we planned to celebrate with a family party. But the big   40   for the kids was the fun of Christmas   41  . They planned weeks ahead of time, asking   42   what the除去乙酸乙酯中残留的乙酸，有效的处理方法是（　　）A．蒸馏B．用过量饱和碳酸钠溶液洗涤后分液C．水洗后分液D．用过量氯化钠溶液洗涤后分液