The abscissa is stretched to twice the original, that is to say, 2x is half of the original. At this time, the equation becomes y = cos (x+1)+1; Then translate one unit to the left, just remember that it is left plus right minus and left plus 1. At this time, y=cos(x+2)+ 1, and then move down by one unit, the equation becomes y=cos(x+ 1). Obviously, this question is B.