血小板聚集的第一时相由下列哪一种因素所引起（）

A.血小板释放血栓烷A

B.血小板释放内源性ATP

C.血小板释放5-羟色胺

D.受损伤组织释放ADP

E.血小板释放内源性ADP

--          weather it is! Let's go out and have a walk.

-- I'd love to.

A．How a fine

B．How fine

C．What fine

D．What a fine