Directions: In this part, there is a passage with ten blanks.For each blank there are four choices marked A, B, C, and D.Choose the best answer for each blank and mark your answer on the Answer Sheet.

Cloud computing(云计算)means storing and accessing data and programs over the Internet instead of your computers hard drive.It  46  computing over a network, where a program or application may run on many connected computers at the same time.

For some, cloud computing is a metaphor( 隐喻 )for the Internet.It  47  uses connected hardware machines called servers

Individual users can use the server’s processing power to run an application, store data, or  48  any other computing task.

For business, cloud computing is an ideal way to reduce  49  .For example, companies may buy services in the cloud.That is to say, instead of  50  applications on every single computer in the company, cloud computing would allow workers to log into a Web-based service(a cloud)which hosts all the  51  individual users would need for their job.

While cloud computing could change the entire computer industry, there are still some  52  about the security of the data stored on the remote machines.It is true that it promise to save a lot of work.However, this technology  53  a fundamental question.Is it safe to store one's data on

someone else's computer? The cloud service provide needs to establish relevant policies that describe  54  the data of each user will be accessed and used.Cloud service users should also to encrypt (加密)  55  that is processed or stored within the cloud to prevent unauthorized access.