单项选择题
A.127.0.0.0B.126.1.1.1C.127.32.53.8D.127.0.0.1
A.122.168.3.30B.121.168.34.32C.120.15.4.33D.192.168.5.34
A.192.168.3.30B.192.168.3.32C.192.168.4.33D.192.168.5.34