五四爱国运动后期的主力是[ ]
A．工人阶级
B．农民
C．学生
D．无产阶级
答案：A
--- Better get down to your work．Jack．
--- __________ ．
A．It’s my pleasure
B．Suit yourself
C．Mind your own business
D．You’re welcome
______、______和______排出体外的过程叫排泄．
