Aabruptadj.生硬的;突然的;唐突的;陡峭的describessomethingthatissuddenandunexpected,andoftenunpleasant
B.quickadj.快的;迅速的,敏捷的;灵敏的happeningordonewithgreatspeed,orlastingonlyashorttime
C.Immediateadj.立即的;直接的;最接近的happeningordonewithoutdelayorverysoonaftersomethingelse
D.instantadj.立即的;紧急的;紧迫的happeningimmediately,withoutanydelay
从manypassengersfallofftheirseats判断,火车是在人们毫无思想准备的情况下突然停的,所以应选A:
1.Thetraincametoanabruptstop,makingmanypassengersfallofftheirseats.
火车突然忽然一下子停了,很多乘客都从座位上跌落下来.