题目内容：
根据下列题干，回答题：A basic premise of OGSA is that everything is （ 66 ） by a service：a network enabledentity that （ 67 ） some capability through the exchange of messages.Computational resources，storage resources，networks，programs，databases，and so forth are all （ 68 ） .This adoption of auniform service-oriented model means that all components of the environment are virtual.Morespecifically，OGSA represents everything as a Grid service：a Web service that conforms （ 69 ） a set of conventions and supports standard interfaces for such purposes as lifetime management.This core set of consistent interfaces，from which all Grid services are implemente
D． （ 70 ） theconstruction of hierarchical，higher-order services that can be treated in a uniform way across layersof abstraction.
请选择（ 66 ）处最佳答案
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