ACCorDing to thE introDuCtion, wE BEComE AwArE oF thE importAnCE oF smEll whEn
A、wE DisCovEr A nEw smEll.
B．wE ExpEriEnCE A powErFul smEll.
C．our ABility to smEll is DAmAgE
D、
D、wE ArE surrounDED By oDours.