外研版高一英语必修一第五单元Module 5 A lesson in a Lab.pptx

;Module 5 A Lesson in a Lab;doing an experiment;tongs ;solid / liquid / gas;balance;1. (a) Water exists as a solid, a liquid and a gas. (b) Water exists as a solid and a liquid only. 2. (a) When you heat a metal, it expands. (b) When you heat a metal, it contracts.;3. (a) Steel is a mixture of iron and other substances. (b) Steel is a mixture of iron and oxygen. 4. (a) Two-thirds of the earth’s surface is water. (b) 50% of the earth’s surface is water.;5. (a) The distance of the sun from the earth is 25,5000 kilometers. (b) The distance of the sun from the earth is 150,500,500 kilometers. 6. (a) The earth is 4.6 million years old. (b) The earth is 4.6 billion years old.;7. (a) The earth is twice as large as the moon. (b) The earth is forty-nine times larger than the moon.;Put the words in pairs or groups.;Answer these questions.;3. Which can be both? Electricity and some metals (alloys for example) can be man-made and occur naturally.;1. When you heat a metal, it expands. expand vi. 膨胀，扩张 Example: 1.The petals of many flowers?expand?in the sunshine.? 许多花的花瓣在阳光中绽放。;反义词 contract vi. 收缩 n. 合同 Example: 1.The heat?contracted?the woolen sweeter. 高温让羊毛衣缩小了。 2. Im under?contract?to teach here for one year.? 我按照聘约要在这里教一年书。;2. Steel is a mixture of iron and other substances. mixture n. 混合物 Example: 1.The?mixture?of drinks made me feel bad. mix v. 混合 mix A with B;substance n. 物质 Example: 1.Beware of what you do with this dangerous?substance.你处理这些危险品时，可要当心。 ;Do exercises 5 and 6 on page 92.;Module 5 A Lesson in a Lab;1. 原级比较：两者程度相同。用句型as+ 形容词/副词+as表示, 否定名式为: not as/so+形容词/副词as。 ;2. 比较级： A. 表示A超过B。此时用形容词和副词的比较级。;B. 表示A不如B。 句型：less+形容词 /副词原级。;3. 形容词和副词比较级的特殊用法 越来越…… 比较级+ and+比较级;B. 越……， 越…… the +比较级+ the +比较级 Example: 1.The more careful you are, the better you will do in the exam. 2.The more you practice, the more fluently y