()是规定法律责任和制裁措施的规范。
参考答案:保护性规范
My brother would like to buy a good watch but ________ was available from that shop. [ ]
A. nothing
B. none
C. no one
D. neither
“字正腔圆”一词中“字正”意指把声母发准确,“腔圆”意指把韵母发全、发响亮。