His ____ ____ is Green.
一度电用途很大,关于它的下列说法,不正确的是( )
选词填空:I sleep____ (on/ in) my bed.
定义在R上的函数f(x)满足f(x+2)=﹣f(x),当﹣1≤x≤1时,f(x)=1﹣x2,则ff(5)等于____