The morpheme is the( )functioning unit in the composition of wor

The morpheme is the( )functioning unit in the composition of words.
【正确答案】：SMALLEST
【题目解析】：本题考查词素的含义。词素是构词中最小的功能单位。比如：denaturalization可划分为de-, nature-, -al, -ize, -ation等5部分，每一部分都有各自的含义，这些都叫做词素。空白处缺最小：smallest