Usage notes of the dictionary explain（ ）

Usage notes of the dictionary explain（ ）
A、the slight difference between words of similar meanings
B、difficult points of grammar and style
C、important British and American differences
D、all the above
【正确答案】：D
【题目解析】：本题主要考查词典的内容——用法注释。用法注释说明了同义词间的细微区别、语法和风格上的难点以及重要的英式和美式区别。