题目

One morning, I was waiting at the bus stop, worried about __41__ (be) late for school. There were many people waiting at the bus stop, __42__ some of them looked very anxious and __43__ (disappoint). When the bus finally came, we all hurried on board. I got a place next __44__ the window, so I had a good view of the sidewalk. A boy on a bike __45__ (catch) my attention. He was riding beside the bus and waving his arms. I heard a passenger behind me shouting to the driver, but he refused __46__ (stop) until we reached the next stop. Still, the boy kept __47__ (ride). He was carrying som17.已知2SO2+O2?2SO3是一个正反应放热的可逆反应.如果反应在密闭容器中进行,则下列有关途述正确的是(  )A.使用催化剂是为了加快反应速率,提高生产效率B.升高温度可加快逆反应速率但不能改变正反应速率C.一定条件下,SO2可100%转化为SO3D.任何条件下,反应达到平衡,SO2的浓度一定等于SO3的浓度
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