题目

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。 Mitchell once had a very serious car accident. More than 65 percent of his  36   was burnt. He was unable to   37   a knife at dinner, or go to the bathroom without  38  . But Mitchell never believed he was    39  . “I am in charge of my own spaceship,” he said. “It’s my up or my down. I could   40    to see this situation as a defeat   4已知等比数列{an}，Sn为其前n项和，S3=10，S6=20，则S9=（ ）A．20B．30C．40D．50