A:y=﹣f(x)在R上是减函数
B:y= 1f(x) 在R上是减函数
C:y=f(x)2在R上是增函数
D:y=af(x)(a为实数)在R上是增函数
①Jane blackboard morning look at open the door sit down
②Please look at the window. OK, Miss Fang.
I think people here are friendly. Do you agree __________ me?
我国基本实现了普及九年义务教育是在( )