【正确答案】：
(1) NAMES OF PEOPLE. WORDS OF THIS GROUP ARE FROM NAMES OF SCIENTISTS, INVENTORS, CHARACTERS IN MYTHOLOGY, HISTORICAL FIGURES AND CHARACTERS IN LITERARY WORKS, ETC. E. G. AMPERE AND WATT ARE FROM FRENCH PHYSICIST AMPERE AND SCOTTISH INVENTOR WATT RESPECTIVELY.
(2) NAMES OF PLACES. MANY WORDS DENOTING PRODUCTS, OBJECTS, OR MATERIALS COME FROM THE NAMES OF PLACES WHERE THEY WERE FIRST PRODUCED, E. G. AFGHAN (A KIND OF KNITTED RUG) FIRST MADE IN AFGHANISTAN.
(3) NAMES OF BOOKS. QUITE A FEW WORDS COME FROM NAMES OF BOOKS AND THUS TAKE ON THE MEANINGS ASSOCIATED WITH THE NAMES DESCRIBED IN THE BOOKS, E. G. CATCH-22 (A PROBLEMATIC SITUATION FOR WHICH THE ONLY SOLUTION IS DENIED BY A CIRCUMSTANCE INHERENT IN THE PROBLEM OR BY A RULE).
(4) TRADENAMES. WORDS LIKE NYLON, ORLON, DACRON, RAYON WERE ORIGINALLY TRADENAMES AND ARE NOW USED TO DENOTE THE FOUR TYPES OF FABRIC.
【题目解析】：(1) 人名：这组词大都来源于科学家、发明家、文学作品中神话人物和历史人物等的名字，如ampere（安培）和watt（瓦特）分别来自法国物理学学家Ampere（安培）和苏格兰发明家Watt（瓦特）。(2) 地名：有许多表示产品、东西或材料的词来自于其原产地的地名，如afghan (一种织毯)原产于Afghanistan（阿富汗）。(3) 书名：还有一些词来源于书名，其含义与书中所描写的事物有关。如Catch-22 不合逻辑的或矛盾的问题（一种有问题的情况，其唯一的解决办法被问题本身的情况或规则所否定）。(4) 商标名：nylon（尼龙）, orlon（奥纶）, dacron（的确良）, rayon（人造丝）等词原来都是商标名，现在用来指这种纤维材料。