开放性气胸诊断最主要的依据（）。 A.锐器伤 B.胸壁有开放伤口 C.呼气时创口有气

http：//www.cernet.edu.cn中，国家域名是______。

A．www
B．cernet
C．edu
D．cn

. The 2010 Shanghai World Expo is well worth ______.

A．visit

B．visited

C．to visit

D．visiting

I ________ a bus on the road.[ ]

A. watch        

B. like            

C. see

The whole program is well designed, but some details need further ______ by some experts.
A. proofing B. modifying C. demonstrating D. polishing

群众路线的核心是( )

A．一切为了群众，一切依靠群众
B．从群众中来
C．到群众中去
D．领导与群众相结合