{{i}} 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.{{/i}}

whAt DoEs thE proFEssor tEll thE stuDEnts to Do ABout thE ArtiClE on thE ChEmiCAl AnD physiologiCAl workings oF thE BrAinA．rEAD AnD Copy thE ArtiClE.
B．rEAD thE ArtiClE AnD writE A summAry on it.
C．rEAD thE ArtiClE AnD writE A pApEr on vitAlism AnD mEChAnism.
D．rEAD thE ArtiClE As A prEpArAtion For thE lECturE nExt wEEk.