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  3. Cloud computing is a phrase used to describe a variety of computing concepts that involve a large number ofcomputers (71) throug

Cloud computing is a phrase used to describe a variety of computing concepts that involve a large number ofcomputers (71) throug

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问题   Cloud computing is a phrase used to describe a variety of computing concepts that involve a large number ofcomputers (71) through a real-time communication network such as the Internet．In science，cloud computing is a (72) for distributed computing over a network， and means the (73) 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 infrastructure layer is built with virtualized compute，storage，and network resources．The platform layer 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 infrastructure layer serves as the (74)  forbuilding the platform layer of the cloud．In turn，the platform layer is a foundation for implementing the (75) layer for SaaS applications．
(71)
选项 A、connected   
B、implemented
C、optimized
D、virtualized
答案A
解析
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