whAt is thE usE oF "AromA Box" At hEAthrow Airport
A．it CAn sEnD A lot oF synthEtiC FrAgrAnCE into thE EnvironmEnt.
B．it is An Air ConDitionEr Blowing with FrEsh Air.
C．it oFtEn pumps thE smEll oF FrEshly-Cut grAss From A high-strEEt shop.
D．it is A Box whiCh sEnDs out not only AromA But Also musiC.