“大约有95%的可能性真分数落在所得分数±1.96SE的范围内，或有5%的可能性落在

Do you often help your mother______?

A．with clean the house

B．cleaning the house

C．to cleaning the house

D．clean the house

It was a _____story, and we all got_____. [ ]

A. shocking; shocking          

B. shocked; shocked  

C. shocking; shocked            

D. shocked; shocking

--- I stayed at a hotel while in New York .

--- Oh, did you? You ＿＿＿＿ with Barbara．

A．could have stayed

B．could stay

C．would stay

D．must have stayed 

男，34岁，主诉：近1～2年自觉全口牙齿松动，咀嚼力量减弱，前牙出现移位。最可能的诊断是（）

A.慢性牙周炎

B.青少年牙周炎

C.快速进展型牙周炎

D.急性多发性牙周脓肿

E.急性坏死性龈炎

不具有民事主体资格的科研组织不得对外订立技术合同。( )