题目

It was the district sports meet. My foot still hadn’t healed(痊愈) from a(n)_________(21) injury. I had_________(22) whether or not I should attend the meet. But there I was,__________(23) for the 3,000-metre run.“Ready… set…”. The gun popped and we were off. The other girls rushed________(24) me. I felt_________(25) as I fell farther and farther behind. “Hooray!” shouted the crowd. It was the loudest________(26) I had ever heard at a meet. The first-place runner was two laps(圈)）ahead of me when she  crossed the finish line. “Maybe I should________(27).” I thought as下列关于实验仪器和用品的选择，不正确的是（　　） A、实验室制备乙烯时加入碎瓷片，可以防止暴沸B、用KMnO4滴定H2C2O4时需要用到两支酸式滴定管C、进行中和热的测定实验时，必须用到两个量筒和两个温度计D、实验室测定化学反应速率时，需要用到仪器秒表