—Which season do you like _________，winter or summer?

—Summer.

A．well

B．better

C．best

D．the best

X线表现肺门增大模糊，肺纹理模糊，肋膈角区见KerleyB线，原因是（）

A.肺动、静脉瘘

B.肺动脉栓塞

C.肺动脉血流量减少

D.肺动脉高压

E.肺静脉高压