Mr. Black told us that the only way to conquer English is to practice __________. [ ]

A. constantly        

B. always            

C. regularly          

D. continually

下列什么原因引起的头痛常表现为持续性胀痛，阵发性加剧，伴有喷射性呕吐和视力障碍

A．偏头痛

B．眼源性头痛

C．颅内高压性头痛

D．鼻源性头痛

E．耳源性头痛