thECpu DoEs not hAvE to look (66) All oF rAm to FinD thE spot it nEEDs.But rAm only (67) thE DAtA tEmporArily.As soon As you switCh thE ComputEr (68) , All thAt inFormAtion DisAppEArs From thE rAm. whEn you switCh thE ComputEr on AgAin, thE rAm is (69) , AnD rEADy (70) A nEw progrAm AnD nEw DAtA、
A．on
B、through
C．For
D．Down upon