When I opened the door, I found my father sitting in his chair, completely ______ in the humorous stories he was reading.

A．absorbed

B．losing

C．attracted

D．addicted

休克的概念为（）

A.血压低、脉率快

B.周围循环衰竭

C.有效循环血容量减少，微循环血液灌注不足、细胞缺氧的综合征

D.贮存于内脏，淋巴血窦中的血量减少所引起的综合征

E.心功能不全，心排出量减少，组织缺氧综合征