2. 计算机
  3. The　ARPANET(66)(　the　rules　of　syntax　that　enable　computers　to　communicate　on　a　network)were　originally　designed　for　openness　and

The　ARPANET(66)(　the　rules　of　syntax　that　enable　computers　to　communicate　on　a　network)were　originally　designed　for　openness　and

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问题 The　ARPANET(66)(　the　rules　of　syntax　that　enable　computers　to　communicate　on　a　network)were　originally　designed　for　openness　and　flexibility,　not　for(67)The　ARPA　researchers　　needed　to　share　information　easily,　so　everyone　needed　to　be　an　unrestricted　"insider"　on　the　network.　Although　the　approach　was　appropriate　at　the　time,　it　is　not　one　that　lends　itself　to　today’s　commercial　and　government　use.
As　more　locations　with　computers(known　as(68)in　Internet　parlance)joined　the　ARPANET,　　the　usefulness　of　the　network　grew.　The　ARPANET　consisted　primarily　of　university　and　government　computers,　and　the　applications　supported　on　this　network　were　simple:　electronic　mail(　E　-　mail),　electronic　news　groups,　and(69)connection　to　other　computers.　By　1971,　the　Internet　linked　about　two　dozen　research　and　government　sites,　and　researchers　had　begun　to　use　it　to　exchange(70)not　directly　related　to　the　ARPANET　itself.　The　network　was　becoming　an　important　tool　for　collaborative　research.
选项 A、safety
B、guard
C、attachment
D、security
答案D
解析 security：安全。
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