重大会议影响着历史的进程
---It's everyone's duty to join the Clean Your Plate Compaign(光盘行动).
---Sure, we should try to all the food that we have ordered.
关于我国季风的叙述,正确的是( )
若全集U=1,2,3,4,5,6,M=2,3,N=1,4,则集合5,6等于( )