题目

据报道：某国际科研小组以一种超低温原子云为“介质”，成功地使光在其中的传播速度降低到17米/秒。下列哪项运动速度比它快:A、苍蝇的飞行速度可达每秒11米;         B、汽车在高速公路上每秒可行驶22米;C、乌龟每小时爬行40米;                        D、奥运冠军刘翔用12秒91跑完110米栏.34、The hurricane did damage to many houses and business buildings.       , it caused 20 deaths. A．However                                                  B．Therefore C．After all                              D．What’s more