客户的两台路由器通过V.35电缆背靠背连接在一起，其中一台路由器上有如下接口信息：[MSR-Serial0/0]displayinterfaceSerial0/0Serial0/0currentstate：UPLineprotocolcurrentstate：UPDescription：Serial6/0InterfaceTheMaximumTransmitUnitis1500，Holdtimeris10（sec）InternetAddressis6.6.6.1/30PrimaryLinklayerprotocolisPPPLCPopened，IPCPopened从上述信息可以得知（）。

A.这台路由器已经和远端设备完成了PPP协商，并成功建立了PPP链路

B.这台路由器和远端设备之间成功完成了PPPPAP或者CHAP的验证

C.在这台路由器上已经可以ping通对端的地址6.6.6.2了

D.该接口信息提示，在该接口下还可以配置第二个IP地址

The kernel is the (66) of an operating system such as Windows98, Windows NT, Mac OS or Unix. The kernel provides basic services for the other parts of the operating system, (67) it possible for it to run several programs at once (multitasking), read and write files and connect to networks and peripherals. Applications and utility programs use the services provided by the kernel to provide practical business functionality.

In operating systems such as Windows or most versions of Unix, the kernel (68) everything except application and utility programs.

In microkernel operating systems such as Digital Unix and Apples forthcoming Mac OS Server, the kernel (69) supports only multitasking and memory management. Other services such as applications, utilities and the user interface support device drivers, API and graphics which all (70) outside the microkernel.

（68）处填（）。

A．include

B．includes

C．exclude

D．including