只封禁一台IP地址为203.168.47.59主机的accesslist的正确配置是（）。

A．access-list 110 permit ip any any
access-list 110 deny ip host 203.168.47.59 any
access-list 110 deny ip any host 203.168.47.59

B．access-list 110 deny ip host 203.168.47.59 any
access-list 110 deny ip any host 203.168.47.59
access-list 110 permit ip any any

C．access-list 110 deny ip host 203.168.47.59 any
access-list 110 deny ip any host 203.168.47.59

D．access-list 110 deny ip host 203.168.47.59 any
access-list 110 permit ip any any
access-list 110 deny ip any host 203.168.47.59

男性，33岁。近5年来反复出现上腹部疼痛，尤以饱餐后明显。今日突然出现右上腹剧痛，5小时后来院就诊。检查：T37．3℃，P100次/分，R16次/分，BPl20/80mmHg。腹平，腹式呼吸消失。全腹压痛、反跳痛，腹肌紧张明显。肝浊音界未叩出。肠鸣音弱。

对诊断最有价值的首选检查是（）

A.腹部B超

B.上消化道造影

C.肛门指诊

D.腹部X线平片

E.胃镜检查

F.腹部CT