孕前知识：孕前检查最佳时间是什么时候孕前知识：孕前检查最佳时间是什么时候？

experiment try to find out How foreigner wsttcked in the trin. B．How pssengers helped ech other on the pltform. C．Pssenger’s rections towrds incidents. D．ctors’ performnces during incidents.A．How a foreigner was attacked in the train．B．How passengers helped each other on the platform．C．Passenger’s reactions towards incidents．D．Actors’ performances during incidents．