Cloud computing is a phrase used to desc

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问题 Cloud computing is a phrase used to describe a variety of computing concepts that involve a large number of computers（） through a real-time communication network such as the Internet. In science, cloud computing is a （请作答此空）for distributed computing over a network, and means the （） to run a program or application on many connected computers at the same time.The architecture of a cloud is developed at three layers: infrastructure, platform, and application. The infrastucture layer is built with virtualized computestorageand network resources. The platform lay-er is for general-purpose and repeated usage of the collection of software resources. The application layer is formed with a collection of all needed software modules for SaaS applications. The infrastucture layer serves as the（） for building the platform layer of the cloud. In turn, the platform layer is founda-tion for implementing the （） layer for SaaS application.A.replacementB.switchC.substituteD.synonym（同义词）

选项 A.replacement
B.switch
C.substitute
D.synonym（同义词）

答案 D

解析云计算是一个用来描述各种计算概念的一个短语，计算概念涉及大量计算机通过实时通信的网络，如Internet，（）在一起。在科学研究中，云计算是分布式网络计算的（请作答此空），意味着有（）同时在多台互连的计算机上运行一个程序或应用。

云的结构分为3层：基础设施、平台和应用。基础实施层由虚拟计算机存储和网络资源构成；平台层是具有通用性和复用性的软件资源的集合；应用层是云上针对SaaS应用的所有应用软件的集合。基础设施层时建立平台层的（）基础；相应地，平台层是执行应用层SaaS（）的基础。
A．替代品 B．转换 C．代替 D．同义词

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Cloud computing is a phrase used to desc

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