A:从13-x=-5,得到13-5=x
B:从-7x+3=-13x-2,得到13x+7x=-3-2
C:从2x+3=3x+4,得到2x-4=3x-3
D:从-5x-7=2x-11,得到11-7=2x-5x
—Look! There is a horse racing program on TV now.
—Hmm. It __________ exciting.