单项选择题
A. It's like a road. B. It's like a struggle. C. There's much business. D. There's much happiness.
A. A teacher. B. A director. C. An operator. D. A programmer.
A. It displays a different singing style. B. It has some distinguishing features. C. It adapts to audiences' different tastes. D. It brings out the best of the singers' voice.