quEstions 18 to 20 ArE BAsED on thE Following pAssAgE.At thE EnD oF thE pAssAgE, you will BE givEn 15 sEConDs to AnswEr thE quEstions.
now listEn to thE pAssAgE.
somE shoppErs ArE not sAtisFiED with thE nEw mAChinE BECAusE ______.A．it mAkEs so mAny mistAkEs
B．thEy CAn’t rEAD thE CoDED priCEs thEmsElvEs
C．thEy wAstE A lot oF timE shopping
D．somEtimEs it is not rEliABlE