使计算机病毒传播范围最广的媒介是( )。

A．硬磁盘

B．软磁盘

C．内存储器

D．Internet

An Intranet is (71) the application of Internet technology within an internal or closed user group．Internets are company and not do not have a (72) connection to the Internet．Usedproperly an Internet is highly effective corporate tool，capable of regularly (73) information toempower the workforce with the information needed to perform their roles．Used in this Way，Internet represent a step towards the (74) office．

A．update

B．updated

C．updates

D．updating