题目解析：
如果以wooden statues做关键词，可能需要大量阅读，所以用排除法。A的larger错，原文没说二者谁大谁小； 根据倒数第三句话，证明BC错， By contrast, wooden statues were carved from several pieces of wood that were pegged together to form the finished workk, and metal statues were either made by wrapping sheet metal around a wooden core or cast by the lost wax process. 原文说木质雕塑是由多块拼接而成的，和B的single pieces矛盾；C错，原文说metal的是由wooden的核包了外皮做的，没说有金属附着在前面，属于概念偷换； D对，而wooden的effect是最后一句说的： The effect is altogether lighter and freer than that achieved in stone, but because both perform the same function, formal wooden and metal statues still display frontality. 这里强调了和石雕相比，木雕更加lighter and freer，所以不同，而且by contrast也说明两者是对照关系。
Statues were normally made of stone, wood, or metal. Stone statues were worked from single rectangular blocks of material and retained the compactness of the original shape. The stone between the arms and the body and between the legs in standing figures or the legs and the seat in seated ones was not normally cut away. From a practical aspect this protected the figures against breakage and psychologically gives the images a sense of strength and power, usually enhanced by a supporting back pillar. By contrast, wooden statues were carved from several pieces of wood that were pegged together to form the finished work, and metal statues were either made by wrapping sheet metal around a wooden core or cast by the lost wax process. The arms could be held away from the body and carry separate items in their hands; there is no back pillar. The effect is altogether lighter and freer than that achieved in stone, but because both perform the same function, formal wooden and metal statues still display frontality.
