在论坛帖子里加入合适的图片，更能生动地图文并茂地叙述内容，将内容丰富起来。（）
参考答案：对
As far as I know, this is a type of music popular in the 1950s, a(n) _____ of jazz and folk music. [ ]
A. mixture
B. tradition
C. practice
D. invention
水分以（）形式存在于汽油中。
A.溶解水.悬浮水
B.溶解水.游离水
C.游离水.悬浮水
D.溶解水.游离水.悬浮水
