She has got two cats now. ______ black and white one is called Rosie and ______ brown one Joseph.

A．The; a

B．A; the

C．The; the

D．A; a

下列哪些是导致冠状血流减少的因素（）

A.左室舒张期末压升高

B.平均动脉压下降

C.主动脉舒张压升高

D.主动脉舒张压下降

E.肺动脉舒张压下降