[单选题]Cloud computing is a style of computing in which dynamically scalabled of ten（72）resources are provided as a service over the internet.
A.real
B.fixed
C.actual
D.virtualized

[单选题]Cloud computing is a style of computing in which dynamically scalabled often ( ) resources are provided as a service over the internet
A.real
B.fixed
C.actual
D.virtualized

[单选题]Cloud computing provides on-demand service to users by using distributed computing and（ ）resource management.
A.network
B.virtual
C.centralized
D.specialized

[单选题]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_（ ）__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 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_（ ）__for building the platform layer of the cloud.In turn,the platform layer is foundation for implementing the_（请作答此空）__layer for SaaS application.
A.resource
B.service
C.application
D.software