邓 * * 提出，加强党的监督，一是党内的监督，二是群众的监督，三是民主党派和无党派人士的监督，但最直接的监督是（）

A.党内监督

B.群众监督

C.民主党派和无党派人士的监督

D.舆论监督

Networks can be interconnected by different devices. In the physical layer, networks can be connected by (66) or Hubs, which just move the bits from one network to an identical network. One layer up we find bridges and swiches, which operate at data link layer. They can accept (67) ,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 netwoks. If two networks have (68) 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 the two transport connections. Finally, in the application layer, application gateways translate message (69) . As an example, gateways between Internet e-mail and X. 400 e-mail must (70) the e-mail message and change various header fields.

（68）是（）

A.special

B.dependent

C.similar

D.dissimilar