“Imagineyouarewalkingalongtheroad.Suddenlyyoufallovera...
问题详情： “Imagineyouarewalkingalongtheroad.Suddenlyyoufalloverandallthepassers-byburstintolaughter.Youfeelvery 1 andthinktheworldislaughingatyou.Butinfact,fiveminuteslater,theyhave 2 iteverhappe...