音乐课的结构是指一节音乐课各个组成部分的（）。
A.搭配和排列
B.配合与组合
C.排列和结合
D.实践和搭配
参考答案：A
Many of them turned a deaf ear to his advice,____they knew it to be valuable. [ ]
A. as if
B. now that
C. even though
D. so that
高频同轴电缆的屏蔽层除起屏蔽作用外,同时又是高频通道的回程导线.
