血管性头痛的特点为

A．男性常见

B．常为持续性头痛

C．多表现全头痛

D．常与情绪变化有关

E．摇头，咳嗽可使头痛减轻

The police asked him to _________what he had seen. 

A．set about

B．set down

C．set up

D．set out