—What's the matter with John? He has been sitting there for hours．

—A postcard from his father        an attack of home - sickness in him．

A．took up

B．set off

C．brought in

D．built up

原发性高血压Ⅲ级眼底表现是

A．眼底正常
B．视网膜动脉变细
C．眼底出血、渗出
D．视网膜动脉变窄，动静脉交叉压迫
E．眼底出血伴视盘水肿