读“北半球某地近地面与高考气压状况（热力原因形成）示意图”，读图回答下列问题。

小题1:关于图示甲、乙、丙、丁四地的说法，正确的是

A．气温：甲＞乙＞丁＞丙

B．海拔：丙＞丁＞甲＞乙

C．密度：乙＞甲＞丁＞丙

D．气压：甲＞乙＞丙＞丁小题2:此时，图中M地吹

A．东北风

B．东南风

C．西北风

D．西南风

Even though current technologies make the ultimate segmented network impractical, new technologies and products hold the promise of making the concept a reality. Most important of all these new technologies are (66) . The ultimate switched LAN, which is technically possible, now, exhibits the following characteristics:

1. High-speed yet cost-effective switching devices can be implemented on a wide scale, providing dedicated connections for individual users and supporting the aggregate (67) of all networked users.

2. The ability to deploy switching capabilities incrementally into the (68) base. Switching implementations support switching of individual users or groups so that existing users of shared media modules can continue to use the existing equipment until they can justify moving to dedicate switched LAN connections.

3. Support and enhancement of existing routed environments. Switching (69) routint, but rather can be introduced into the network without making any changes to the existing routing equipment or configuration. (70) play a critical role in the integration of switching into existing networks.

（67）（）

A. assigned

B. does not justify

C. replace

D. does not replace