–Are they ______books?

--No, they aren't. They're ______ books.

A．you; they

B．your; he

C．your; her

D．your; she

梗死的原因不包括（）

A.血栓形成

B.动脉栓塞

C.血管受压闭塞

D.静脉淤血

E.动脉痉挛