-- I had a quarrel with my friend Jim yesterday,and now I _______ it.
-- Why not go and say sorry to him at once?It's never too late to mend.
关于自然界的水循环,下列说法中正确的是( )
已知f(x)=(2x+1)3﹣2ax+3a,若f′(﹣1)=8,则f(﹣1)=( )