A Lesson In a Lab Introduction Vocabulary and Speaking

Listening Guess, listen and check the answer. 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 kilometres. (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 these words in pairs or groups. air contract earth gas liquid oxygen moon solid sun expand 1) air — gas — oxygen 2) contract — expand 3) earth — sun — moon 4) gas — liquid — solid

electricity iron metal steel air glass Answer the questions. electricity iron metal steel air glass Which of the above are natural? Electricity, iron, some metals and air are natural. 2. Which are man-made? Electricity , steel, some metals and glass are man-made.

3. Which can be both? Electricity and some metals can be man-made and occur naturally.

百位数的读法 1.基数词的读法： A. 先说“几十”， 再说“几”，中间用连字符。如： 23— 89— twenty-three eighty-nine B. 先说“几百”， 再加and,再加末两位数（或末位数）。如： 223— 416— 809— two hundred and twenty-three four hundred and sixteen eight hundred and nine

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

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 ninth eighth twelfth

B. 以-ty结尾的词，要先变-y为-i，再加-eth。如： twenty— forty— C. 以one, two, three, five, nine收尾的多位数词，要照第一条方法变。如： twenty-one— twenty-two — thirty-five — ninety-nine— a hundred and fifty-three — twentieth fortieth twenty-first twenty-second thirty-fifth ninety-ninth a hundred and fifty-third

¼— 2/3— 3.分数词的读法 基数词表示分子，序数词表示分母，除了分子是“1”的情况外，序数词要用复数。如： 7/9— 5/12— — ¼— 2/3— 7/9— 5/12— — one-fourth two-thirds five-twelfths seven-ninths 3 2 two and three-fifths 5 7 thirty and seven-eighths 30 8

½— ¼— ¾— 一些特殊的表达法 a / one half a / one quarter three quarters 7.8— 0.4— 0.03— 0.125— 14.397— seven point eight zero point four zero point zero three zero point one two five fourteen point three nine seven

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

Practice Read the following numbers. two-fifths 2/5 5/8 9/10 3/8 five-eighths nine-tenths three-eighths

point five 0.5 0.8 1.23 796,000 point eight one point two three seven hundred and ninety-six thousand

P49 Everyday English A B Choose the correct meaning. 1. Where do we go from here? Means______ A) What shall we do next? B) Is this the right way? 2. Keep the noise down means___. A) Don’t talk B) Talk quietly A B

A B A 3.You’ve got it! means ______. A) You’ve understood B) You have something. 4. Go ahead! means______. A) Go away B) Begin 5) It’s your turn means ____. A) You’re next B) Turn round A B A