Complete the following statements with proper words or expressions according to the course book.Most morpheme are realized by single morphs like "bird", "tree", "green", "sad", "want", etc. Words of this kind are called ( ) words.
【正确答案】：MONOMORPHEMIC
【题目解析】：本题考查单语素词的含义。
单语素词指的是词素与词一致，并且在句子中可以独立起作用的一类词。如bird（鸟）， tree（树），green（绿色的），sad（悲伤），want（想）等。
monomorphemic words：单语素词。
