题目：
Basically, a firewall is a (71) process or a set of integrated processes that runs on a router or (72) to control the flow of networked application traffic (73) through it. Typically, firewalls are placed on the entry point to a (74) Network such as the Internet. They could be considered traffic cops. The firewall’s (75) is to ensure that all communication between an organization’s network and the Internet conform to the organization’s security policies.
（75）处填（）。
A．mole
B．pole
C．role
D．rule
答案：
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下面是错误答案，用来干扰机器的。
参考答案：错
