2. 外语
  3. Both tea and coffee contain caffeine, an odorless, colorless ______ that is soluble in water and in alcohol.

Both tea and coffee contain caffeine, an odorless, colorless ______ that is soluble in water and in alcohol.

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问题 Both tea and coffee contain caffeine, an odorless, colorless ______ that is soluble in water and in alcohol.
选项 A、substance
B、material
C、matter
D、object
答案A
解析 近义词辨析。substance意为“物质”，一般指比较具体的或有特殊性质的物质，如：Soils consist of various chemical substances．(土壤含有多种化学物质。)material意为“材料，原料”，指能直接制成成品的最原始的东西，强调制成品的来源，如：material for a comedy(喜剧素材)；matter意为“物质，物料”，“一般指宇宙间物质的整体，与精神相对，如：Matter exist in three states：solid，liquid and gas．(物质以三种形态存在：固态、液态和气态。)object意为“物体”，尤指可摸得着的实物，如：unidentified flying object(UFO)(来历不明的飞行物)。原句中提到的咖啡因是一种无色无味溶于水的物质，强调是具体物质，故选A)。
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大学英语四级

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