—I haven’t seen you walk your dog recently? Why?

—Well, I have _______ the habit, as it _______ too much of my spare time.

A．given out; takes for

B．given in; takes for

C．given up; takes up

D．given off; takes up

IP协议属于（）

A.点到点、无连接、可靠的通信协议 

B.点到点、无连接、不可靠的通信协议 

C.点到点、有连接、不可靠的通信协议 

D.无连接、不可靠的通信协议