外研版Book1 Module 5 A Lesson in a Lab Period 1 Introduction&vocabulary课件(共31张PPT)

课件31张PPT。Module 5
A Lesson in a LabIntroduction
and vocabularydoing an experimentapparatus(es)[,?p?'reit?s]crucibletongs balanceBunsen burnertest tubeMore Words in Module 5
solid [‘s?lid] 固体
liquid [‘likwid] 液体
gas [g?s] 气体
expand [ik‘sp?nd] 扩张
contract [‘k?ntr?kt ] 收缩
mixture [‘mikst??] 混合物
substance [‘s?bst?ns] 物质
oxygen [‘?ksid??n] 氧气
dissolve [di ‘z?lv]溶解，分解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.Guess and check the answer. Quiz on Page 413. (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 25,500 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.air – gas - oxygencontract - expandearth – sun - moongas – liquid - solidcontract air earth gas
liquid oxygen moon solid
sun expand23electricity iron metal steel air glass Answer these questions.Which of the above are natural?

2. Which are man-made?
3. Which can be both?
Electricity, iron, some metals,air. Steel, some metals and glass . Electricity and some metals. Vocabulary and speaking 基数词(cardinal number)
序数词(ordinal number)
分数(fraction)
小数(decimal)
百分数(percentage)的读法1. 基数词(cardinal number)的读法A. “十位” +连字符+“个位”，。
e.g. 23—
89—B. “百位”加and,再加末两位。
e.g. 223—
416—
809— twenty-three eighty-ninetwo hundred and twenty-threefour hundred and sixteeneight hundred and nineC. 千位以上，
100 250 350 555。

e.g. 1,001—
9,743—
750,000,000— billion, million, thousand, hundred ，-ty,teen . No"yi" and "wan" in English, , , one thousand and onenine thousand, seven hundred and forty-threeseven hundred and fifty
million2. 序数词(ordinal number)的读法序数词一般以与之相应的基数词加-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。A. one — two —
three— five—
eight — nine—
twelve—firstsecondthirdfiftheighthninthtwelfthB. 以-ty结尾的词，先变-y为-ie，再加-th。
e.g. twenty— forty—
C. 多位基数词，变词尾。
e.g. twenty-one—
twenty-two —
ninety-nine—
a hundred and fifty-three — twentiethfortiethtwenty-firsttwenty-secondninety-ninth
a hundred and fifty-third子基，母序，分子大于1，分母用复数。
e.g. 1 / 4 —
2 / 3—
7 / 9—
5 / 12— one-fourthtwo-thirdsseven-ninthsfive-twelfths3. 分数词(fraction)的读法特殊的表达法?—
?—
?— a / one halfa / one quarterthree quarters4. 小数(decimal [`desiml] )的读法7.8—
0.125—
14.397— seven point eightzero point one two fivefourteen point three nine seven5. 百分数(percentage)的读法
27% —
45% —
86% —twenty-seven percent forty-five percent eighty-six percentSay them again, first as decimals, then as percentageVocabulary on Page 46
Activity 1
Say these numbers as decimals2?—
?—
2?—
?—
30?—
12?— Two point five Two point fiveTwo point two fivepoint seven fivethirty point fivetwelve point fiveRead these questions aloud and say the answers.What is 1 / 2 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 million4. 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 ? of 1,000,500,000?
seven hundred, fifty million, three hundred, seventy-five thousand
6. What is 10% of 800,000,000?
eighty million 1. Finish Exercises in the workbook.
2. Work in pairs. Give your partner five sums. Use numbers over a million.