读下列材料和图表，回答问题。

材料一 燃烧煤、石油、天然气等化石能源产生的废气，影响气候、危及人体健康的问题日益严峻。因而，太阳能、核能、风能、潮汐能等新能源的开发利用受到广泛重视。据测算，全球可开发风能总量比水能总量大十倍。我国沿海地区也蕴藏着丰富的风能资源。

材料二 下图为亚马孙河河口位置

请回答下图框中的内容，显示燃烧化石能源对人体危害的过程，以反映开发新能源的必要性。

Networks can be interconnected by different devices. In the physical layer, networks can be connected by (1) or hubs, which just move the bits from one network to an identical network. One layer up we find bridges and switches, which operate at data link layer. They can accept (2) , examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two networks. If two networks have (3) network layer, the router may be able to translate between the packet formats. In the transport layer we find transport gateway, which can interface between two transport connections. Finally, in the application layer, application gateways translate message (4) . As an example, gateways between Internet e-mail and X.400 e-mail must (5) the e-mail message and change various header fields.

A．analyze

B．parse

C．delete

D．create