4. Introduction - 3.Quiz time.(4m) Choose the correct answers to the quiz in Part 1. Then listen and check your answers. 1.Water exists as a solid, a liquid and a gas. 2.When you heat a metal, it expands. 3.Steel is a mixture of iron and other substances. 4.Two-thirds of the earth’s surface is water. 5.The distance of the sun from the earth is 150,500,500 kilometres. 6.The earth is 4.6 billion years old. 7.The earth is forty-nine times larger than the moon. Answers:

5. Introduction – 4.Classification(2m) Put the words in pairs or groups. contract air earth gas liquid oxygen moon solid moon solid expand sun contract air earth gas liquid oxygen moon solid moon solid expand sun 12 3 4 air – gas - oxygen contract - expand earth – sun - moon gas – liquid - solid

6. Introduction – 5.Classification(2m) Put words in the right place. electricity iron metal steel air glass electricity iron metal steel air glass naturalman-made both electricity iron air some metals steel glass some metals electricity some metals (alloy for example)

7. Look at the pictures collected by our classmates. Do you know the name of these equipment ？ test tube tongs balance crucible beaker & glass rod Bunsen burner

8. Since you are interested in doing scientific experiments, now let’s get to know some vocabulary and knowledge related to science and experiment. Potassium （钾）

9. Sodium ( 钠 ) Calcium ( 钙 ) Magnesium ( 镁 )

10. Aluminium （铝） Zinc （锌） Iron （铁） Copper （铜）

12. 英语中基数词、序数词、 分数、小数和百分数的 读法

13. 1. 基数词的读法： A. 先说 “ 几十 ” ， 再说 “ 几 ” ，中间用连字 符。如： 23— 89— B. 先说 “ 几百 ” ， 再加 and, 再加末两位数 （或末位数）。如： 223— 416— 809— twenty-three eighty-nine two hundred and twenty-three four hundred and sixteen eight hundred and nine

14. C. 1000 以上的数先从后向前数，每三位数加 一 “,” （千分位）；第一个 “,” 号前为 thousand; 第二个 “,” 号前为 million; 第三个 “,” 号前为 billion 。如： 1,001— 4,000— 9,743— 174,301— 750,000,000— one thousand and one four thousand nine thousand, seven hundred and forty-three a (one) hundred and seventy-four thousand, three hundred and one seven hundred and fifty million

15. 2. 序数词的读法 序数词一般以与之相应的基数词加词 尾 -th 构成，如： tenth （第十），但下 面这些基数词在变序数词时， 有特别 的地方。如： A. one — two — three— five— eight — nine— twelve— first second third fifth eighth ninth twelfth

16. fraction We write 1/5 1/6 1/7 4/7 We say one fifth one sixth one seventh four sevenths

17. 7/10 97/111 seven tenths ninety-seven one hundred and elevenths 45/87forty-five eighty-sevenths 总结 : 你能看出他们有什么特点吗？ 分子用基数词, 分母用序数词 ; 分子大 于 1, 分母的序数词需要加 s 。

18. 另外, 还有几个特殊表达的情况 : 1/2 1/4 1/3 3/4 2/3 A half is the same as 50 percent. one half one quarter one third 33.33r % r:recurring three quarters two thirds 66.66% 50% 25% 75% 百分数： percentage

19. 5) 百分数的读法 27% — 45% — 86% — twenty-seven percent forty-five percent eighty-six percent

20. Can you say the following in English correctly? 1,000 2,000 12,000 112,000 796,000 one thousand two thousand twelve thousand one hundred and twelve thousand seven hundred and ninety six thousand

21. 879,457 eight hundred and seventy-nine thousand, four hundred and fifty-seven 1,000,000 9,000,000 32,000,000 212,000,000 one million nine million thirty-two million two hundred and twelve million

22. 988,766,688 nine hundred and eighty-eight million, seven hundred and sixty-six thousand, six hundred and eighty-eight 987,654,321 nine hundred and eighty-seven million, six hundred and fifty-four thousand, three hundred and twenty- one

23. 1,000,000,000 one billion 9,000,000,000 nine billion 32,000,000,000thirty-two billion 564,865,000,000 five hundred, sixty-four billion, eight hundred, sixty-five million

24. 978,876,675,467 nine hundred and seventy-eight billion, eight hundred and seventy- six million, six hundred and seventy- five thousand, four hundred and sixty-seven

25. Practice Now let’s say: 2/5 5/8 9/10 3/8 5/6 two-fifthsfive-eighths nine-tenthsthree-eighths five-sixths

26. Can you say the following in English correctly? 0.5 0.8 0.76 1.23 point five point eight point seven six one point two three

27. 23.45 100.32 87.675 7.564 twenty-three point four five one hundred point three two eighty-seven point six seven five seven point five six four point 总结：小数点用 point

28. Read these questions aloud and say the answers. 1.What is ½ of 6,000,000? 2. How much is 35,246,000 plus 12,800,000? 3. What is 25% of 200,000,000? three million forty-eight million, forty-six thousand fifty million

29. 4. How much is 260,408,396 and 5,284,700? two hundred, sixty-five million, six hundred, ninety-three thousand, ninety- six 5. What is ¾ of 1,000,500,000? seven hundred, fifty million, three hundred, seventy-five thousand 6. What is 10% of 800,000,000? eighty million

30. Homework Finish Exercise 9 on P 93.