题目

如图所示一架飞机水平地匀速飞行，飞机上每隔1s释放一个铁球，先后共释放4个，若不计空气阻力，则落地前四个铁球彼此在空中的排列情况是： 答案：B Our strong sympathy for the people in the earthquake-stricken area is ________ in the ceremony. A. reacted                                B. reflected                         C. responded            D. recovered