Module 5 A Lesson in a LabListening Speaking Writing课件（外研版必修1）.ppt

_______squeeze the lemon and pour the juice in the container.________take the pen and dip it into the lemon juice._________write your message in large letters on a clean sheet of white writing paper.____ _____blow on the paper to dry the lemon juice. ______light a candle with matches._____________ hold the paper near the candle flame. After that blow on the paper to dry the lemon juice . Next light a candle with matches.Finally hold the paper near the candle flame and you will see the message appears gradually. Therefore, we can draw the conclusion that the message appears when it’s heated because the lemon juice reacts with oxygen in the air. Module 5 A Lesson in a Lab Listening Speaking Writing 1. Learn to read different numbers. 2. Learn to write an experiment report. 3. Get to know how to express sequence. Vocabulary and speaking 英语中基数词、序数词、分数、小数和百分数，你会读吗？ 1,000,000,000 billion million thousand 1. 基数词的读法 A. 先说“几十”， 再说“几”，中间用连字符。例如： 23— 89— B. 先说“几百”， 再加and,再加末两位数（或末位 数）。例如： 223— 416— 809— twenty-three eighty-nine 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）；从后向前，第一个“,”号前为 thousand; 第二个“,”号前为million; 第三个“,”号前 为billion。例如： 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， 例如：tenth（第十），但下面这些基数词在变序 数词时，有特别的地方。例如： one — two — three— five— eight — nine— twelve— first second third fifth eighth ninth twelfth 1/4 1/3 4/5 3/4 1/2 3. 分数表达法1) 先说分子, 后说分母;2) 分子用基数词, 分母用序数词；3) 分子大于1, 分母加 –s a quarter = one quarter a third = one third four-fifths three quarters = three fourths a half = one half 4. 小数的读法 23.45 100.32 87.675 7.564 twenty-three point fou