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问题 单项选择题

（）指的是基于平台上的应用服务，包括交易之外的其他产业链、价值链上的增值服务。

A、农业电子商务服务交易服务

B、农业电子商务支撑服务

C、农业电子商务衍生服务

D、农业电子商务生产服务

答案

参考答案：C

单项选择题

At a basic level,cloud computing is simply a means of delivering ITresources as ____(71)___.Almost all IT resources can be belivered as a cloud service:applications,compute power,storage capacity,networking,programming tools,even communication services and collaboration ____(72)____. Cloud computing began as large-scale Internet service providers such as Google,Amazon,and others built out their infrastructure.Anarchitecture emerged:massively scaled,____(73)____ distributed system resources,abstracted as virtual IT services and managed as continuously configured,pooled resources.In this architecture,the data is mostly resident on ___(74)___ "somewhere on the Internet" and the application runs on both the "cloud servers" and the user’s browser. Both clouds and grids are built to scale horizontally very efficiently.Both are built to withstand failures of ___(75)___ elements or nodes.Both are charged on a per-use basis.But while grids typically process batch jobs,with a defined start and end point,cloud services can be continuous.What’s more,clouds expand the types of resources available - file storage,databases,and Web services - and extend the applicability to Web and enterprise applications.

（73）处填（）。

A．horizontally

B．vertically

C．inclined

D．decreasingly
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单项选择题

目前世界普遍感到用水紧张的原因是（）

1.环境污染严重，水质下降

2.全球气候变暖，蒸发量大，江河径流量下降

3.人口急剧增长，工农业及生活用水增长快

4.世界上水资源总量不足

A.①②

B.②③

C.③④

D.①③
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