Should another world war break out, what would _________ human beings?

A．happen

B．become

C．become of

D．happen as

青年男性患者，无明显外伤史，出现视力下降，伴明显玻璃体积血，应考虑哪种疾病（）

A.糖尿病视网膜病变

B.中央静脉阻塞

C.视网膜静脉周围炎

D.视网膜脱离

E.视盘血管炎