《说课unit13Senior2.ppt》由会员分享，可在线阅读，更多相关《说课unit13Senior2.ppt（24页珍藏版）》请在三一文库上搜索。
1、,Welcome !,The earth is a water planet.,Unit 13 The Water Planet,Where there is water, there is life!,properties,What properties or characteristics do you know about water?,colorless,tasteless,odorless,three forms,feeling wet,absorbing heat,dissolving,Fast Reading,THE PROPERTIES OF WATER,CHEMICAL ST
2、RUCTURE,SALINITY,DENSITY,HEAT CAPACITY,OCEAN MOTION,Skimming,Find out: water properties,Water is a liquid at room temperature, and it has a relatively high freezing point. The reason why water can dissolve most substances on earth is that water has high heat capacity. Like all the other substances,
3、water gets smaller (contract 缩小) when it freezes. Pure water has a higher freezing point and lighter than salt water. The salinity of the earths oceans is about 3.5%. When water freezes, its density increases. Other recourses such as oil, gas, gold etc is as precious as a drop of rain.,Quiz: True or
4、 False,Careful Reading,Paragraph 1. What makes the ocean such a great place to live? A.air B.sunshine C.water D.wind,Normal state of water: solid liquid gas,negative end: + ,positive end: + ,polar: + ,Paragraph 2. H2O:2_ + 1_ = 1_,Hydrogen Atoms,Oxygen Atom,H2O Molecule,salinity of sea water: 35 35%
5、,Paragraph 3. sea water (salt water) = _+ _+_ salinity of sea water affects: _and_,dissolved gases,dissolved solids,pure water,weight,freezing point,Paragraph 4. Factors of density: _and _ Unit of density: _ = _ Density of pure water: _= _,mass,volume,kg/m3,kilograms per cubic meter,1,000 kg/m3,one
6、cubic meter of water weighs one thousand kilograms,Opposite word/phrase of absorb: give off change create,Heat capacity: water temperature substance energy,Paragraph 5.,Paragraph 6. How does the water in the ocean move?,Paragraph 7. Main idea: _,significance of water to nature,Dense water sinks and
7、less dense water is pushed to the surface.,Salinity,Density,Ocean motion,Whats the relationship between each two of them?,1.Life in the oceans ranges from the tiniest plankton all the way up to giants like sharks and whales.,Language points,range from A to B : vary from A to B,价格自五美元至十美元不等.,Prices r
8、anged from 5 dollars to 10 dollars.,2.Water is quite simple,but the way the water is formed gives water its unique properties.,(that/in which),水是非常简单的，但水分子的结构方式却赋予水以独特的性质。,Correction: 1.I dont like the way in that you speak to me. 2.The way in which you give me is better. 3.The way you thought of so
9、lve the problem was reasonable.,to,3.The nutrients in whatever falls into the ocean quickly became available.,anything that,that can be used or obtained,Whatever happens, keep on trying.,no matter what,Its generally considered unwise to give a child_ he or she wants. A.however B.whatever C.whichever
10、 D.whenever,4.Density is measured in kilogrammes per cubic metre.,以计算，用测量,The river measures 150 feet wide. A clock is used to measure time. A persons success cant be measured in terms of money. Well make a new suit to your own measure. The water is so polluted that we should take measures to make i
11、t clean.,(vi.有长.宽.高.体积.容量等）,（vt.测量）,(vt.衡量，考虑）,（n.尺寸）,maketo ones own measure,(n.措施）,Useful expressions: that is : that is to say be made up of : consist of / be composed of break down /in/into/away from/out/up take advantage of : make use of something properly be sensitive to : affected easily by s
12、omething depend on :rely on,Multiple Choice: 1._ how hard I pushed,the door stayed closed. A.Even if B.Since C.Though D.No matter 2.-Dont you believe me? -_, I believe _ you say. A.No ; whatever B.Yes ; no matter what C.No ; no matter what D.Yes ; whatever 3.The world is _ seven continents and four
13、oceans. A.made up of B.made out of C. made from D.made in 4.I am sorry to arrive late but the car _ on the way. A.broke down B.broke up C.broke off D.broke out,4.It is the Suez Canal _ separates Asia_ Africa. A.which ; to B.that ; from C./ ; from D. where; was 5.Who do you think is the great writer_
14、? A.lively B.alive C.live D.living 6.The Olympic Games,_ in 776B.C.,didnt included women players until 1912. A.first playing B.to be first played C.first played D.to be first playing 7.The suitcase_15 pound and_ 2 metres long and 1 metre wide. C.weighty; measured A.is weighed; is measured B.weighs;
15、measures,Write an article about RIVER POLLUTED according to the materials given below.,Homework,RIVER POLLUTED Numerous dead fish can be found floating on the surface of the Haihe River,the symbol of Tianjin city,because of serious pollution this summer.In a report,Tianjin Evening News called on residents to help protect the river against pollution. From CHINA DAILY 这是摘自中国日报的一则短讯。读后，请你写一篇100字左右的短评。内容如下： 1 像中国日报所报道的此类河水污染情况，还不止发生在海河，全国不少地区也存在。 2 众所周知，环境污染对人类危害极大。现在越来越多的人开始认识到这个问题的严重性。 3 我国政府正在努力采取措施与污染做斗争。我们相信一定能取得斗争的胜利。,See you,