--- How much homework has your cousin finished?

--- _______ at all. He has sat there the whole morning, doing _______.

A．None; nothing

B．Nothing; none

C．No one; nothing

D．None; none

腹部空腔脏器损伤主要表现为()

A.腹膜刺激征 

B.腹腔内出血 

C.移动性浊音 

D.立即进入休克 

E.恶心呕吐