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111Module 5 A lesson in a labTeaching aims: Enabling the ss to 1. know some words related to experiments, the lab and something like that 2. review the usage of numbers/ fractions/ percentages 3. know sth about Degrees of comparison.Teaching steps: I. All of us have learned physics, biology and chemistry in middle school. Now lets have a test to see how much you know.Deal with Activity 1 on page 41. Choose the correct answers to the quiz. Now play the tape for the students to listen and check their answers. Answers: 1 a 2 a 3 a 4 a 5 b 6 b 7 b II. Activity 2. First read the words and then ask the ss to translate them into Chinese. At last put them in pairs or groups. Answers: air-gas-oxygen contract-expand earth- sun- moon gas-liquid-solid III. Activity 3. Answer the questions. Answers: 1) Electricity, iron, some metals and air are natural 2) Steel, some metals and glass are man-made 3) Electricity and some metals can be man-made and occur naturallyIV. Turn to page 42. Activity 1 Read the numbers. 注意：and 的位置billion, million, thousand, and - -V. Fractions.基数词+序数词，当分子大于1时，分母要加s作主语时，谓语动词要根据of 后面的名词决定。Answers:two-fifths five-eighths nine-tenths three-eighths five-sixthsVI. Percentages基数词+ percent/ per cent 注意：percent 永远单数形式作主语时，谓语动词要根据of 后面的名词决定。VII. Degrees of comparison 1 & 2英语倍数表达法 用英语表达A 是 B 的 N 倍长（宽，高，大，重等），A 比 B 长（宽，高，大，重等）N 倍 或A 的长度（宽度，高度，大小，重量等）是 B 的 N 倍，可用下列几种句型。1.A + be + 倍数 + as + 计量形容词原级 + as + B. This tree is three times as tall as that one. 这棵树是那棵树的三倍高。 His father is twice as old as he. 他父亲的年纪有他两倍大。 2.A + be + 倍数 + 计量形容词比较级 + than + B The Yangtze River is almost twice longer than the Pearl River. 长江差不多比珠江长两倍。 The dictionary is exactly five times more expensive than that one. 这本字典比那本恰好贵5倍。 3.A + be + 倍数 + the + 计量名词 + of + B The newly broadened square id four times the size of the previous one. 新扩建的广场是未扩建时的四倍大。 4.The + 计量名词 + of + A + be + 倍数 + that + of + B The size of the newly broadened square is four times that of the previous one. 新扩建的广场为以前的四倍大。 5.其它 Im twice/ double his age. 我的年龄是他的两倍。 Ive paid five times the usual price for the stamp. 我出了5倍于往常的价格买这枚邮票。 The average income of the staff has been increased by 50 percent compared with last year. 与去年相比，该单位职工的收入增加了50%. The price of TVs are twofold( adj. 两部分的, 双重的) down over these years. 近几年来，电视机的价格下降了两倍。 the +比较级，the +比较级意为“越，越”。前面部分是从句，后面部分是主句。The harder you work, the more successful you will be. The earlier you come, the better place you can find. “比较级+and+比较级”表示“越来越”。 He becomes fatter and fatter 比较级前还可以用much，even，still，a little等来修饰。 VIII. Deal with the exercises on pages 45 , 46 and 47111
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