Chairs and desks are made of ________.A.woodB.some woodsC.woodenD.the woods
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A解析物质名词通常不加冠词,又无复数形式。常见的物质名词:stone,coal,chalk,brick,earth,glass,cloth,cotton,silk,paper,ink,oil,soap,food,salt,coffee.meat,rice,wheat.milk,bread,fruit.sugar,tea,soup,air,steel,copper,oxygen,water,ice,grass.wind,snow,smoke,fire,money。