Each 14 is able to carve and decorate the car as he chooses.
答案：(B) scout
Each scout（每位童軍）呼應全文主題 Cub Scouts（幼童軍），表示每位童軍都能依自己喜好雕刻裝飾賽車；race（比賽）、master（團長）、parent（家長，但下文明確是男孩們自己動手）均不符合此處語意。
本題大考中心未公布逐題答對率，以下不談數據，只談觀念。
只讀這一句的話，四個都放得進去——每一場比賽、每個童軍、每位團長、每位家長，中文讀起來都成立，所以光看句內是選不出來的。而且文章開頭提過 with the help of parents（在家長協助下），parent 會顯得特別有理。
線索在前一句，要回頭讀。前一句是 The Scout is given a block of wood ...（拿到材料的是童軍），接著 The finished car must use all nine pieces（完成的車必須用上全部九個零件）。這一整段從頭到尾都在說童軍拿到什麼、要做出什麼，所以「可以自己雕刻與裝飾」的當然也是童軍本人，填 scout。句尾的 as he chooses（照他自己的意思）指的也是同一個人。這一題示範的是一個很實用的習慣：句內四個選項都通的時候，不要硬在句內比較，往前一句找那個一直在做事的人。
race（比賽）不會雕刻東西，主詞與動詞對不上。master（團長）在文章裡只出現一次，是辦第一屆比賽的 Cub Master Don Murphy，那是特定的一個人、不是每一屆都有的角色，Each 修飾不上去。parent（家長）雖然開頭提過會幫忙，但「幫忙」與「自己決定怎麼雕、怎麼裝飾」是兩回事，而且最後一段講得很清楚，這件事的重點是孩子與爸爸、爺爺一起做。
carve（雕刻）、decorate（裝飾）、as he chooses（照他自己的意思）、be able to V（能夠……）、exceed a certain weight（超過一定的重量）、fit on the track（放得上軌道）
The Pinewood Derby is a racing event for Cub Scouts in the Boy Scouts of America. Cub Scouts, with the help of parents, build their own cars from wood, usually from kits 11 a block of pine, plastic wheels, and metal axles.
Cub Master Don Murphy organized the first Pinewood Derby, held May 15, 1953 in Manhattan Beach, California. Murphy's son was too young to participate in the popular Soap Box Derby races, so he 12 the idea of racing miniature wooden cars.
The Scout is given a block of wood made of pine 13 two notches for wheels, four plastic wheels, and four nails. The finished car must use all nine pieces, must not exceed a certain weight, must not exceed a certain length and must fit on the track. Each 14 is able to carve and decorate the car as he chooses.
The great thing about the race is that the boys build the cars with their dads, grandfathers, or 15 they choose. It's not about winning or losing; it is about having the quality time with each other and enjoying a great day with family, friends and smiling faces.