有这样一道试题： The teacher said ________snow is white，but ________ snow on the road is red. Why?http://yingyu.chazidian.com A. the，the B. ×，× C. the，× D. ×，the 此题应选D，容易误选B，误认为：snow是物质名词，其前永远不用冠词。 在通常情况下，物质名词和抽象名词在表示一般概念(即泛指)时，不用冠词(即使有描绘性定语修饰也不用冠词)。但是如果物质名词和抽象名词不是表示一般概念，而是表示某一特定内容(尤其是有一限定性定语修饰)时，或当它们表示“一种”、“一场”、“一份”等意思时，则可以加冠词。试做以下试题： (1) I like to eat ________fish，but ________fish I ate last night made me sick. A. the; the B. ×; × C. the; × D. ×; the (2) ________ air is necessary to life，but ________ air around here is not fresh. A. the; the B. ×; × C. the; × D. ×; the (3) A：Do you like to listen to _________ music? B：It all depends. In fact I only like ________ music by Mozart. A. the; the B. ×; × C. the; × D. ×; the (4) A：He has no sense of ________ humour. B：No，you didn’t catch ________ humour in his remark. A. the; the B. ×; × C. the; × D. ×; the 答案：1. D 2. D 3. D 4. D