Root words like "man", "earth", "anger" are also called（）.

Root words like "man", "earth", "anger" are also called（）.
A、allomorphs
B、free morphemes
C、basic words
D、bound morphemes
【正确答案】：B
【题目解析】：彼此之间相互独立的词素叫做自由词素，其本身具有完整的意义，在句子中用作自由语法单位。