如图,△ABC平移到△EFG,则图中共有平行线( )
This pair of jeans______ hand, and it______ very comfortable.
已知函数f(x)=﹣x2+ax+b(a,b∈R)对任意实数x都有f(1+x)=f(1﹣x)成立,若当x∈﹣1,1时f(x)>0恒成立,则b的取值范围____