【正确答案】：
BLENDING IS THE FORMATION OF NEW WORDS BY COMBINING PARTS OF TWO WORDS OR A WORD PLUS A PART OF ANOTHER WORD. WORDS FORMED IN THIS WAY ARE CALLED BLENDS.
AS FAR AS THE STRUCTURE IS CONCERNED, BLENDS FALL INTO FOUR MAJOR GROUPS:
(1) HEAD + TAIL: MOTEL FROM (MOTOR +HOTEL)
(2) HEAD + HEAD: SITCOM FROM (SITUATION + COMEDY)
(3) HEAD+ WORD: MEDICARE FROM (MEDICAL + CARE)
(4) WORD + TAIL: WORKFARE FROM (WORK+ WELFARE)
【题目解析】：本题考查拼缀法。拼缀法是通过合并两个词的某些部分或一个词与另一个词的一部分相加来构成新词。根据结构，拼缀法分为四组：（1）头+尾：motel（汽车旅馆）=motor +hotel （2）头+头：sitcom（情境戏剧）=situation + comedy（3）头+词：medicare（医疗保险）=medical + care（4）词+头：workfare（工作福利制）=work+ welfare
