“节奏”性
参考答案:
音乐最基本的表现手段,是指音响的长短、强弱、轻重等有规律的组合,它是旋律的骨干,也是乐曲结构的主要因素,使乐曲体现出情感的波动起伏,增强了音乐的表现力。
上消化道出血最常见的病因是
A.门脉高压症
B.胃十二指肠溃疡
C.胃癌
D.胆道出血
E.出血性胃炎
— Why on earth didn't you answer the phone?
— I'm terribly sorry, but the doorbell _____, too. [ ]
A. is ringing
B. rang
C. was ringing
D. has rung