亚非分界线是 [ ] A．巴拿马运河 B．基尔运河 C．克拉运河 D．苏伊士运河

You are too fat. You must _____ eat _____ meat.       [ ]

A. try; more  

B. try to; more  

C. try to; less  

D. try; less

His efforts to raise money for his program were________ because no one showed any intention to

take a cent out of their pockets.  [ ]

A. in place

B. in vain

C. in sight

D. in order

有关双侧唇裂婴幼儿的麻醉，以下哪项不正确（）

A.复杂手术或身体较差的患儿应做输血准备

B.置入喉镜中要注意勿伤杓前突或使其脱位

C.插管前用软塑料填充齿槽裂，以免插管中喉镜滑入

D.6个月的患儿需术前禁食4～6小时

E.术前要禁用吗啡或哌替啶

DEM接边时，对粗差点如何处理？