【正确答案】：
① BACK-FORMATION IS CONSIDERED TO BE THE OPPOSITE PROCESS OF SUFFIXATION. 
② AS WE KNOW, SUFFIXATION IS THE FORMATION OF NEW WORDS BY ADDING SUFFIXES TO BASES, AND BACK-FORMATION IS THEREFORE THE METHOD OF CREATING WORDS BY REMOVING THE SUPPOSED SUFFIXES.
③ THIS IS BECAUSE MANY OF THE REMOVED SUFFIXES ARE NOT TRUE SUFFIXES BUT INSEPARABLE PARTS OF THE WORDS.  
【题目解析】：本题考查逆生法和后缀法的区别。1.逆生法被认为是后缀法的对立过程。2.后缀法是通过在词基上添加后缀，而逆生法是通过除去假定的后缀而创造新词的方法。3.被除去的后缀并不是真正意义的后缀，而是这些词不可分离的部分。