京剧音乐由丰富的板式，仅二黄腔调就有多种，你能说出其中五种吗？
参考答案：二黄导板、二黄碰板、二黄原板、二黄慢板、二黄散板、二黄摇板、二黄滚板。唢呐二黄
Little _____ abut his own safety, though he was in great danger himself. [ ]
A. does he care
B. did he care
C. he cares
D. he cared
高锰酸钾滴定法常用的酸性介质是______。
