阅读理解Below is a table which shows the melting(液化)and boiling points of mon substances.Study the table.Then do Numbers 4—7.SubstanceMelting point(C)Boiling Point(C)WaterAlcoholNitrogenOxygen0–117–210-21810078–196–1831.The underlined word‘substances'means‘a type of'_________A.matterB.liquidC.solidD.gas2.Which of the four should be a liquid at-90 degrees?A.waterB.alcoholC.nitrogenD.oxygen3.Mixing alcohol and water is often used to wash windscreens of cars during the wintertime because _________A.it is easier for alcohol to change into gasB.alcohol is not easily separated from waterC.alcohol freezes at lower temperature than waterD.the mixture is not expensive4.In order to change water from a solid to a liquid energy must be _________A.removedB.addedC.createdD.destroyed
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ABCB解析1.substance 表示“物质”的意思。2.因为根据表格所示酒精在-117度开始溶化，那么在-90度时肯定是液体。3.冬天天气寒冷，酒精比水不容易结冰。4.水从固体变成液体，必需加温。