6、thatabackgroundnoise,whichdoesn’tchangetoomuch(music,forexample)mayevenhelppeopletopayattention. Peoplearetestingwaystomakelessnoise.Thereareevenlawsc 9 noise.Wecan’t r 10 tothe“goodolddays”ofpeaceandquiet.Butwecanmakelessnoise---ifweshoutloudlyenoughaboutit 八 There