1960年，周大风创作《（）》，优美、轻快、动听、受到广大群众喜爱，后被联合国教科文组织选为亚太地区民族音乐的教材。
参考答案：采茶舞曲
He likes challenges and he enjoys ________ new ideas. [ ]
A. trying on
B. trying out
C. trying up
D. trying over
叙述7000空分空冷系统的工艺流程。
