With smart phones taking the world by ____ storm, a phone that can only send and receive voice calls and

text messages may seem like ____ relic. [ ]

A. a; a

B. the; 不填

C. the；a

D. 不填; a

稻瘟病穗颈瘟发生穗颈部，使穗颈变成黑褐色，最后干枯腐烂