Idiom types like idioms nominal in nature, idioms adjectival in nature, and idioms verbal in nature are classified according to （ ）.
A、lexical functions
B、grammatical functions
C、contextual functions
D、cultural functions
【正确答案】：B
【题目解析】：本题考查习语的分类。Idiom types like idioms nominal in nature, idioms adjectival in nature, idioms verbal in nature ，idioms adverbial in nature and sentence idioms are classified according to grammatical functions.根据语法功能，习语可以分为名词性习语、形容词性习语，动词性习语，副词性习语和句式习语。故选B。A选项lexical functions——词汇功能；C选项contextual functions——语境功能；D选项cultural functions——文化功能。
