2. 计算机
  3. The　purpose　of(66)is　to　enlarge　the(67),　the　set　of　addresses　a　program　can　utilize.　　For　example,　it　might　contain　twice　as　man

The　purpose　of(66)is　to　enlarge　the(67),　the　set　of　addresses　a　program　can　utilize.　　For　example,　it　might　contain　twice　as　man

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问题 The　purpose　of(66)is　to　enlarge　the(67),　the　set　of　addresses　a　program　can　utilize.　　For　example,　it　might　contain　twice　as　many　addresses　as　main　memory.　A　program　using　all　of　it,　therefore,　would　not　be　able　to　fit　in　main　memory　all　at　once.　Nevertheless,　the　computer　could　execute　such　a　program　by　Copying　into　main　memory　those　portions　of　the　program　needed　at　any　given　point　during　execution.
To　facilitate　copying(66)into　real　memory,　the　operating　system　divides　it　into　pages,　each　of　which　contains　a　fixed　number　of　addresses.　Each　page　is　stored　on　a　disk　until　ii　is　needed.　When　the　page　is　needed,　the　operating　system　copies　it　from　disk　to　main　memory,　translating　the(68)into　real　addresses.　The　process　of　translating　virtual　addresses　into　real　addresses　is　called(69).　The　copying　of　virtual　pages　from　disk　to　main　memory　is　known　as(70)or　swapping.
选项 A、drawing
B、mapping
C、picturing
D、scanning
答案B
解析 mapping：映射
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