WLANs are increasingly popular because they enable cost-effective connections among people, applications and data that were not possible, or not cost-effective, in the past. For example, WLAN-based applications can enable fine-grained management of supply and distribution (1) to improve their efficiency and reduce (2) . WLANs can also enable entirely new business processes. To cite but one example, hospitals are using WLAN-enabled point-of-care applications to reduce errors and improve overall (3) care. WLAN management solutions provide a variety of other benefits can be substantial but difficult to measure. For example, they can protect corporate data by preventing (4) through rogue access points. They help control salary costs, by allowing IT staffs to manage larger networks without adding staff. And they can improve overall network management by integrating with customers’ existing systems, such as Open View and UniCenter. Fortunately, it isn’t necessary to measure these benefits to justify investing in WLAN management solutions, which can quickly pay for themselves simply by minimizing time-consuming (5) and administrative chores.

4（）

A．intrusion

B．aggression

C．inbreak

D．infall

历史的人要办历史的事，既不要超越历史，去干那些办不到的事情；也不要推卸历史的责任，该干的事情也不去办。 对这句话理解正确的是(　)

A．办历史的事要量力而为

B．办事要对历史负责

C．办历史的事反对冒进

D．要经得起历史的考验