题目内容：
根据下列题干，回答题：The web is an information space．Human beings have a lot of mental machinery for manipula-
tin9，imaginin9，and finding their way in spaces．URIs are the （ 1 ）in that space．
Unlike web data formats，where HTML is an important one，but not the only one，and web pmto- cols，where HTTP has a similar status，there is only one Web（ 2 ）)technology：URIs． Uniform Resource Identifiers(URIs，aka URLs)are short strings that （ 3 ）resources in the web： documents，images，downloadable files，services，electronic mailboxes，and other resources．They make resources（ 4 ）under a variety of naming schemes and（ 5 ）methods such as HTTP，FrP，and Interact mail addressable in the same simple way．They reduce the tedium of”log in to this server．then issue thi{ magic command…”down to a single click．
It is an extensible technology：there are a number of existing addressing schemes，and more may be incorporated over time．
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