Complete the following statements with proper words or expressio

Complete the following statements with proper words or expressions according to the course book.Morphemes which are identical with root words are considered to be( ). 
【正确答案】：FREE
【题目解析】：自由词素与根词一致，因为根词就是由单个的自由词素构成的，如 man，earth，wind，car，anger等。