题目

When 47-year-old volunteer Susan Boyle stepped onto the stage of Britain’s Got Talent and announced she was unemployed, had never been married and “never been kissed, actually”, few in the audience would have wondered why. This Ms Boyle, looking unfashionable, from a village in Scotland, shocked the three judges and the audience with the song I dreamed a dream from the musical Les Miserables on a show of Britain’s Got Talent, one of the hottest reality shows in Britain. She couldn’t hide the awkwardness when walking to the center of the stage in a housedress, and everyone — includi做匀加速直线运动的质点，在第5s末的速度为8m/s，则(     )A．加速度大小是1.6 m/s2B．加速度大小可能不是1.6 m/s2C．前10s内位移大小是80 mD．前10s内位移大小可能不是80 m