Functional words do not have notions of their own.Therefore they

Functional words do not have notions of their own.Therefore they are also called_words.
A、neutral
B、empty
C、notional
D、free
【正确答案】：B
【名师解析】:功能性词语本身不具备特定的意义，因此它们被称为“empty words”。选项B“empty”符合这一描述，所以正确答案是B。