Having lived in the town for many years，Mr Smith no longer felt________among the local people.[ ]

A．out of control  

B．out of touch

C．out of place  

D．out of use

SR88-X配置了一块8端口万兆板卡，如果要达到线速转发，需要配置多少块交换网板（）。

A.3块B类交换网板

B.3块D类交换网板

C.4块B类交换网板

D.4块D类交换网板