Bob never does his homework ______  Mary. He makes lots of mistakes. [ ]

A. so careful as

B. as more carefully as

C. so carefully as

D. as careful as

对巨大动静脉畸形施行切除术，以下哪项措施无助于避免正常灌注压突破综合征的发生（）

A.术前对脑动静脉畸形进行血管内栓塞治疗

B.术中注意保护畸形血管团周围正常脑组织的引流静脉

C.切除畸形血管团，术中及术后适当行控制性降压

D.迅速切除畸形血管团

E.术后予以脱水、降颅压治疗