21f的精选

问题详情：已知f(x)满足f(4)=f(-2)=1,f′(x)为其导函数,且导函数y=f′(x)的图象如图所示,则f(x)<1的解集是()A.(-2,0)                  B.(-2,4)C.(0,4)               D.(-∞,2)∪(...