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1、 Look at the pictures collected by our classmates. Do you know the name of these equipment？test tube tongs balancecrucible beaker & glass rod Bunsen burner Since you are interested in doing scientific experiments, now lets get to know some vocabulary and knowledge related to science and experiment.P

2、otassium （鉀）（鉀） Sodium(鈉鈉) Calcium(鈣鈣) Magnesium(鎂鎂)Aluminium（鋁）（鋁） Zinc （鋅）（鋅） Iron （鐵）（鐵） Copper （銅）（銅）英語中基數(shù)詞、序數(shù)詞、分?jǐn)?shù)、小數(shù)和百分?jǐn)?shù)的讀法1.基數(shù)詞的讀法：基數(shù)詞的讀法：A. 先說先說“幾十幾十”， 再說再說“幾幾”，中間，中間用連字符。如：用連字符。如：23 89B. 先說先說“幾百幾百”， 再加再加and, ,再加末兩位再加末兩位數(shù)（或末位數(shù)）。如：數(shù)（或末位數(shù)）。如：223 416 809 twenty-three eighty-ninetwo hundred and t

3、wenty-threefour hundred and sixteeneight hundred and nineC. 1000以上的數(shù)先從后向前數(shù)，每三位數(shù)加以上的數(shù)先從后向前數(shù)，每三位數(shù)加一一“,”（千分位）；第一個（千分位）；第一個“,”號前為號前為thousand; 第二個第二個“,”號前為號前為million; 第三個第三個“,”號前為號前為billion。如：。如：1,001 4,000 9,743 174,301750,000,000 one thousand and onefour thousandnine thousand, seven hundred and forty-t

4、hreea (one) hundred and seventy-four thousand, three hundred and oneseven hundred and fifty million2.序數(shù)詞的讀法序數(shù)詞的讀法序數(shù)詞一般以與之相應(yīng)的基數(shù)詞加詞序數(shù)詞一般以與之相應(yīng)的基數(shù)詞加詞尾尾-th構(gòu)成，如：構(gòu)成，如：tenth（第十），但下（第十），但下面這些基數(shù)詞在變序數(shù)詞時，面這些基數(shù)詞在變序數(shù)詞時， 有特別有特別的地方。如：的地方。如：A. one two three five eight nine twelvefirstsecondthirdfiftheighthninthtwelf

5、thfractionWe write1/5 1/61/74/7We sayone fifthone sixthone seventhfour sevenths7/10 97/111seven tenths ninety-seven one hundred and elevenths 45/87forty-five eighty-sevenths總結(jié)總結(jié): 你能看出他們有什么特點嗎？你能看出他們有什么特點嗎？分子用基數(shù)詞分子用基數(shù)詞, ,分母用序數(shù)詞分母用序數(shù)詞;分子大分子大于于1,分母的序數(shù)詞需要加分母的序數(shù)詞需要加s。另外另外, 還有幾個特殊表達的情況還有幾個特殊表達的情況:1/21/4 1

6、/3 3/42/3A half is the same as 50 percent.one half one quarter one third 33.33r % r:recurringthree quarters two thirds 66.66%50%25%75% 百分?jǐn)?shù)：百分?jǐn)?shù)： percentage5) 百分?jǐn)?shù)的讀法百分?jǐn)?shù)的讀法27% 45% 86% twenty-seven percent forty-five percent eighty-six percentCan you say the following in English correctly?1,000 2,000 12

7、,000 112,000796,000one thousandtwo thousandtwelve thousandone hundred and twelve thousandseven hundred and ninety six thousand879,457eight hundred and seventy-nine thousand, four hundred and fifty-seven 1,000,000 9,000,00032,000,000 212,000,000one million nine millionthirty-two milliontwo hundred an

8、d twelve million988,766,688nine hundred and eighty-eight million, seven hundred and sixty-six thousand, six hundred and eighty-eight987,654,321nine hundred and eighty-seven million, six hundred and fifty-four thousand, three hundred and twenty-one1,000,000,000one billion9,000,000,000nine billion32,0

9、00,000,000thirty-two billion564,865,000,000five hundred, sixty-four billion, eight hundred, sixty-five million978,876,675,467nine hundred and seventy-eight billion, eight hundred and seventy-six million, six hundred and seventy-five thousand, four hundred and sixty-seven PracticeNow lets say: 2/5 5/

10、8 9/10 3/8 5/6two-fifthsfive-eighthsnine-tenths three-eighthsfive-sixthsCan you say the following in English correctly?0.50.80.761.23point fivepoint eight point seven sixone point two three23.45100.3287.6757.564twenty-three point four fiveone hundred point three two eighty-seven point six seven five

11、 seven point five six four pointpointpointpoint總結(jié)：小數(shù)點用pointRead these questions aloud and say the answers.1. What is of 6,000,000?2. How much is 35,246,000 plus 12,800,000?3. What is 25% of 200,000,000?three millionforty-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 HomeworkFinish Exercise 9 on P 93.