2. 计算机
  3. The　UNIX　operating　system　is　made　up　of　three　parts;　the　kernel,　the　shell　and　the　programs.　The　kernel　of　UNIX　is　the(71)of　the

The　UNIX　operating　system　is　made　up　of　three　parts;　the　kernel,　the　shell　and　the　programs.　The　kernel　of　UNIX　is　the(71)of　the

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问题 The　UNIX　operating　system　is　made　up　of　three　parts;　the　kernel,　the　shell　and　the　programs.　The　kernel　of　UNIX　is　the(71)of　the　operating　system:　it　allocates　time　and　memory　to　programs　and　handles　the　filestore　and　communications　in　response　to(72).　　　The　shell　acts　as　an(73)between　the　user　and　the　kernel.　When　a　user　logs　in,　the(74)program　checks　the　username　and　password,　and　then　starts　another　program　called　the　shell.　The　shell　is　a　command　line(75)(CLI).　It　interprets　the　commands　the　user　types　in　and　arranges　for　them　to　be　carded　out.　The　commands　are　themselves　programs:　when　they　terminate,　the　shell　gives　the　user　another　prompt(%　on　our　systems).
选项 A、hub
B、center
C、core
D、nucleus
答案A
解析 hub：中心
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