简单算术表达式的结构可以用下面的上下文无关文法进行描述（E为开始符号），（ ）是符合该文法的句子。
E→T|E+T
T→F|T*F
F→-F|N
N→0|1|2|3l4|5|6|7|8|9
- A.2--3*4
- B.2+-3*4
- C.（2+3）*4
- D.2*4-3
正确答案及解析
正确答案
解析
一个上下文无关语法定义一个语言，其主要思想是从文法的开始符号出发，反复连续使用产生式，对非终结符进行替换和展开。
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