1、学习目标: 1. 学习新单词和掌握文章的主旨大意 2. 提高学生的阅读能力学习重点: 学习了解这两个科学实验学习难点: 数字，分数表达法预习案使用说明&学法指导：1.预习时，把课文读两遍，第一遍通读教材，完成表层理解，第二遍勾画出文中的疑难点。2.完成时间30分钟。一. Introduction. 1. Words about general science. Translate the following: 1. 大众科学 2.固体 3. 液体 4. 气体 5. 存在 6. 加热 7. 膨胀 8. 收缩 9. 金属 10. 钢 11. 铁 12. 混合物 13. 物质 14. 氧气 15.
2、表面 16. 自然的,天然的 17. 人造的 2. Do Ex. 1, 2, 3, (P41)二、Vocabulary1. (1)十二（一打） (2)二十 (3)百 (4)千 (5)百万 (6)十亿 (7)dozens of (8) scores of (9)hundreds of (10)thousands of (11)millions of 2. 分数表达： 口诀：“分子基数词，分母序数词。分子大于1，分母加s”1/3 4/5 a quarter 3/4 三、Reading and Vocabulary Reading comprehension. Listen to passage A
3、 and fill in the blanks. It is hard to a world without metals. Different metals have different uses, , steel is used in cars, and iron electrical equipment. When we use metals, it is important to know how they with different , for example, water and oxygen. The of metals can be Here is a table with
4、metals that react most , and the metals that react least . II. Structure : Read passage B and fill in the blanksPlease fill in each blank within three words after reading the text on Page 45_1_To find out if iron rusts in dry air, air-free water and ordinary water Apparatus 3 clean iron nails ; test
5、 tubes ; _2_;cotton wool ; oil ; Bunsen burner Situation _3_4_Conclusion Iron in dry airPut some iron nails _5_ of a test tube Push some _6_ down the tube Leave the tube for one weekThe nails have not rustedIron does not rust in dry airIron in air-free water Half-fill a test tube with water Boil the
6、 water for three minutes to _7_ there is no air in the water Put _8_clean nails in the water Add _9_to the water to keep air out of the water Leave the tube for one week .The nails do not rust Iron does not rust in air-free water Iron in ordinary water Half-fill a test tube with water and add two or
7、 three _10_Leave the tube for one week The nails rust Iron rusts in ordinary water 探究案I. Read the passage A & B carefully and answer the following question. 1. Which is the best title for the passage A? A. The Different uses of Metals B. The Reaction of Metals C. The Reaction of Metals with WaterD.
8、The Reaction of Metals with Oxygen2. According to Passage A, we know that is often used in cars, and is often used in electrical equipment. A. steel, copper B. iron, zinc C. steel, ironD. iron, copper3. Which metal doesnt react with water? A. Sodium B. Iron C. Copper D. Potassium 4. Which metal reac
9、ts with steam? A. Calcium B. ZincC. CopperD. Sodium 5. If you put a shovel (铁锨)in a damp place, it will there. A. rust B. form an oxide C. not rust D. keep the place dry 6. Iron rusts in . A. dry air B. air-free water C. ordinary air D. ordinary water 7. According to Passage B, we know that the “air
10、-free water” probably means . A. air with a lot of water B. air without water C. water with plenty of air D. water without air II. 须掌握的短语： 1.add 往加入 2. to 过去常常 3. the area of在领域 4.be proud 为感到骄傲 5. be supposed 应当，理应 6.at 至少 7.draw a 得出结论 8.make 确信 9. or或者或者 10. be astonished 对.感到吃惊 11. find 查明 12. a
11、im 瞄准，针对 13. put 把按顺序放好 14. keep 把保持在外 15.write 写下，记下 16. the air在空中 17. the pastyears在过去的年里 18.go 用吧；行 19. learn 向学习 20. an experiment 做试验III. 合作探究.1.【课文原句】1. It is hard to think of a world without metals . P44句型剖析 本句属于“It +is +形容词+不定式。其中It是_主语，不定式是_主语。It is easier to say than _说比做容易。It is no good
12、_(play) computer games . It is a shame that _(很遗憾他没有通过考试)It is never too late to study . _(英译汉)活学活用It has been proved _ eating vegetables in childhood helps to protect you against serious illnesses in later life . A. if B. because C. when D. that 2.【课文原句】When we use metals , it is important to know
13、how they react with different substances , for example , water and oxygen . 句型剖析 该句子是_(简单、并列、复合句)。It是形式主语，真正的主语是_. 其中How they react 又作know 的_从句。 （主语从句、宾语从句）；when 用来引导_从句 。for example 作为插入语。(for example ,such as )填空.I have travelled many cities_ Bei jing,Shang hai, Guangzhou.Some students, _, John, l
14、ive in the city.小结：for example _ Such as _3. 【课文原句】Here is a table with the metals that react most at the top , and the metals that react least at the bottom . P441)本句是here由引起的_句子，其中，with the metals 为介词短语作_，修饰table，句中两个that 都引导定语从句，分别修饰两个metals . 2) 句子以there, here , out , in , up , down , away , now
15、 , then 等词开头，并且谓语动词为be, go ,come 等时，要用全部倒装，起强调作用。 例如： Here is the key to your room . There comes a ray of light from outside . Now comes your turn . Out went the children . 如果主语是人称代词时，则谓语不用倒装。例如：Away they went ./Here you are . /Here it is. 知识点配套练习：1. A balloon as it is filled with air. A. is increas
16、ed B. increase C. expands D. is expanded2. 改错(1) How did your mother react with the news?(2) Applause reacts against a speaker.(3) The students reacted on the political system.3. The workers went to strike to the price policy. A. react on B. react with C. react to D. react against4. (1) Say numbers
17、(按顺序).(2) I cant get in touch with him now, because my telephone is .(出了故障)(3) The room is .(乱七八糟)(4) He with that factory.(向定购了500辆自行车)5. (1) These figures dont (加起来) right.(2) His whole school education (合计) no more than one year.6翻译句子 （1）30的1/5是多少？（2）1000的30是多少？（3）我们市的人口是多少？7. The scientist also
18、other experiments. A. made B. carried out C. performed D. A、BC8.Do remember to take this medicine three times a day with warm boiled water. . A. Heard it. B. Got it. C. Made it. D. Taken it.9. There are often some fields the scientists devote all their lives to doing some researches. A. on which B.
19、which C. that D. in which10. Water electricity widely all over the world. A. is used to produce B. is used to producingC. used to produce D. used to producing11.用astonish, surprise, shock, amaze的适当形式填空. (1) To my , the door was unlocked.(2) He was to see his father there.(3) His death was a great to
20、 the family.(4) We are all that he won the first place.12. (1) Neither you nor Tom (be) interested in pop music.(2) Both you and he (be) right.13. she doesnt come, we will still go. Which one is WRONG? A. If B. Suppose C. Supposing D. Though14. All her neighbors her to be a good girl. A. thought B.
21、supposed C. imagined D. AB15. My brother is than I. A. older two years B. two years olderC. two years elder D. elder two years16. There are magazines in our library than in yours. A. a less B. less C. a fewer D. fewer17. The city of Beijing is getting . A. more beautiful and beautiful B. beautifuler
22、 and beautifuler C. more and more beautiful D. more beautiful and more beautiful18. This house is that one. A. three times the size of B. 3 times as large asC. twice larger than D. A、BC19. The earth is nearly the moon. A. 50 time the size of B. 50 times the size ofC. 50 times as size as D. 50 times
23、as that of20. With the help of the German experts, the factory produced cars in 1998 as the year before. A. as twice as many B. as many as twiceC. as twice as much D. twice as many21. It was as I had ever spent. A. so a pleasant day B. as a pleasant day C. as pleasant a day D. a day as pleasant 22.W
24、hat do you think of his opinion?None has given me piece of advice.A. a better B. a best C. the best D. the better参考答案：一、1. general science 2. solid 3. liquid 4. air 5. exist6. heat7. expand8. contract 9. metal10. steel11. iron12. mixture13. substance 14. oxygen 15. surface 16. natural17. man-made 二、
25、I: 1. dozen2. score 3. hundred 4. thousand 5. million6. billion 7. 许多，大量的8. 许多9. 成百上千10. 成千上万的 11. 百万计的2: 分数：one third four fifths 1/4three quarters 三、: think of for exampleis used in react substances reaction put in order at the top at the bottom II. 1.aim 2. test tube holder 3. method 4.result 5.
26、at the bottom of6. cotton wool 7. make sure 8. two or three 9. some oil 10. clean nails 探究案：I. 1. B2. C3. C4. B5. A6. D7. DII: 1. to 2. used 3. in 4. of 5. to 6. least 7. conclusion 8. sure 9. either 10. at 11. out 12. at 13. in order 14. out of 15. down 16. in 17. in 18. ahead 19. from 20. do/ make
27、/ carry out/ performIII. 形式;真正; to do; （in）playing ; he didnt pass the exam; 学习永远不会太迟 ；D2. 复合；不定式；宾从；条件状语从句；such as; for example3. 倒装；伴随配套练习：1.C 2. withto againston/upon onagainst 3.D4. in order; out of order; in bad order; placed an order for 500 bikes.5. add up; add up to6. whats one- fifth of thirty ?; what is thirty percent of one thousand? Whats the population of our city?7-10 DBDA 11.surprise; astonish ; shock; amazed 12 is ;are13-22 DDB DCDBD CA