题目

第二节 完形填空（共20小题；每小题1.5分，满分30分）    阅读下面短文，从短文后各题所给的四个选项（A、B、C、D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。 “Hey, Dad, are you going to come to my award ceremony tonight?” I   36   asked my father. “I have to work late tonight. I doubt whether I’ll be able to   37   it on time. I am just too busy right now,” he replied.        My mind could not   38   the idea that he would be too busy working late. He was also too busy to   39 �一定温度下，某一密闭恒容容器内有可逆反应：A（g）＋3B（g） 2C（g）。该反应进行到一定限度后达到了化学平衡，该化学平衡的标志是（    ）A．单位时间内生成amol物质A，同时生成3amol物质BB．容器内气体的密度不再随时间而改变C．C物质的生成速率和分解速率相等D．A、B、C三种物质的分子数之比为1：3：2