外研版 (2019)选择性必修 第一册Unit 5 Revealing nature课文内容ppt课件

这是一份外研版 (2019)选择性必修 第一册Unit 5 Revealing nature课文内容ppt课件，共29页。PPT课件主要包含了break down， habitat， ecosystem， primitive， ancestor等内容，欢迎下载使用。

Unit 5Revealing nature
Bidiversity
1. T listen fr main idea and specific infrmatin2. T summarize a cnversatin and make a presentatin3. T read and think critically, giving mre examples n the tpic4. T develp the awareness f respecting the ecsystem
March 3rd marks Wrld Wildlife Day, a day dedicated by the United Natins t raise awareness fr the prtectin f wildlife and bidiversity, which are essential t human survival. The 2020 theme is “Sustaining all life n earth”. Enjy a vide and get mre.
What is bidiversity in yur mind?
1. bidiversity 生物多样性 (由bilgy和diversity合成)2. bacteria (pl.)细菌 (single) bacterium3. species 物种4. rganic matter 有机物5. immune systems 免疫系统6. ecsystem 生态系统7. cell 细胞
Sme useful wrds r expressins yu may meet in yur listening:
Listen t the pdcast and chse the statements that are made.
1. Bidiversity is imprtant.2. Bacteria are always harmful t humans.3. Sme species f bacteria are used in fd prductin.4. Many species f bacteria recycle dead rganic matter.5. Our immune systems are able t fight ff all germs.
Listen again and cmplete the fact sheet.
CellsEvery living thing is ________________. They are like ________________________________.In the human bdy there are abut _____________ human cells and arund __________________ bacteria cells.BacteriaMst bacteria in the human bdy can ___________________.In the fd prductin prcess, bacteria can ____________ dead rganic matter.
made up f cells
bricks that are used t build huses
thirty trillin
thirty-nine trillin
help with digestin
Nw wrk in pairs. Discuss what yu knw abut cells and bacteria.
Cmplete the bxes with the expressins frm the pdcast.
Checking backgrund knwledge
D yu knw Have yu heard f the way, … In fact,, Speaking f which, ...
Adding infrmatin
D yu knw yu heard f
By the way, …Actually, fact, f which, ...
Read the passage and answer the questins.
What species are mentined and what is special abut them?2. What ther unusual life frms d yu knw f? pen.
Tw species are mentined: the blue whale and the water bear. The blue whale is the largest animal species n Earth, which can grw up t almst 30 metres in length and weigh ver 130,000 kils. The water bear is prbably the tughest species, which can survive temperatures frm 150℃ t belw freezing -272℃.
Cmplete the paragraphs with the crrect frm f the wrds and expressins.
ancestr scientific be native t primitive habitat appearance be hme t ecsystem
The Galapags Islands are renwned wrldwide fr their unique bidiversity. The Giant Trtise Reserve n Santa Cruz (1) __________ several species f giant trtise that (2) ____________ the Galapags Islands. The island is als hme t the Charles Darwin Research Statin, where (3) ___________ studies are carried ut.
are native t
scientific
Mangrves are ne f the castal plants that grw n Isabela. They serve as the (4) ________ fr varius birds and fish, and are very imprtant t the (5) ___________.
Iguanas can be fund n San Cristbal. They have a very special (6) ____________, with cmb-like spines n their back. There is evidence that all the different iguanas have develped frm mre (7) _________ nes and share a cmmn (8) _________.
appearance
Lk at the pictures f the species native t different regins f China. Talk abut bidiversity in China using the wrds and expressins in this sectin. D nline research t find mre infrmatin.
Have yu ever heard f the peacck in the suthwestern China?
I knw the habitat f them is ht and wet areas. D yu knw anything abut the appearance f them?
Useful expressins:speciesecsystembidiversityscientificprimitivehabitatappearancebe native t …
Supplementary infrmatin
The mammal yaks can live in the highest plateau, mainly in the Himalayas and Tibetan Plateau. Yaks, usually dark brwn r black in clr, have very lng and thick fur cvered all their bdies. Their limbs are shrt but strng. All these characteristics make yaks can live in the area f 3000-5000 metres abve sea level and 30-40 degrees belwzer. Nearly 85% f yaksin the wrld are living in China.
Diversifrm-leaved pplar trees (胡杨林) mainly grw in 20 cuntries, including Mnglia and sme n the Mediterranean. Xinjiang grws 91 percent f diversifrm-leaved pplar trees in China. The trees are estimated t have a histry f three millin years, accrding t its fssils fund in 1935 in Xinjiang and neighbring Gansu prvince.
Hwever, During the 1960-1970 perid, large areas f diversifrm-leaved pplar trees were felled (砍伐树木) in sme areas in Xinjiang t make rm fr farming, greatly deterirating the lcal eclgical envirnment with desert incursin int ases (绿洲). Intrductin f laws and plicies, alng with increasing prtectin awareness amng the public, have kept the rare trees frm destructin.
Peaccks are mainly fund in Yunnan prvince, in the suthwest f China. Accrding t a survey by the Kunming Institute f Zlgy, part f the Chinese Academy f Sciences, fewer than 500 f the green peaccks may still exist, and it has nw becme ne f China’s mst endangered wildlife species, even rarer than the giant panda.
Siberian tigers, therwise knwn as Amur r Manchurian tigers, mainly live in eastern Russia, Nrtheast China andthe nrthern part f the Krean Peninsula. Frest and muntain areas in the eastern part f Jilin have lng been the habitat fr Siberian tigers, and a mnitring center has been established cvering 500 square meters t keep track f the animals.
In recent years, wild Siberian tigers have been sighted frequently in the regin thanks t its imprving natural envirnment. Official statistics shw Jilin currently has 42 nature reserves cvering 2.61 millin hectares f land, and accunting fr 13.9 percent f all land f Jilin.
Dawn redwd trees (水杉) are large fast-grwing Chinese mnecius (雌雄同株的) tree having flat bright-green deciduus (树木每年落叶的) leaves and small glbular cnes (球果) .
Als knwn as the metasequia, the tree is native t Hubei, Hunan and Sichuan prvinces and widely regarded as a living fssil since its existence dates back t the Cretaceus (白垩纪的) perid, but has been planted in a vast regins acrss China that are suth f Beijing in recent years t be used fr harvesting and fr rnament. It has high academic value as ne precius relic plant.
Nw talk abut what methds yu used t cllect the infrmatin required. Cmpare yur methds with yur partner’s and think abut which methds are mre efficient.
Hw many species did yu learn?What is special abut them?Hw can we check backgrund knwledge r add infrmatin in a cnversatin?What is bidiversity in yur mind nw?
Illustrate anther unusual life frm and bidiversity in China. Yu may use the newly learned wrds and expressins:sme species, rganic matter, germ, bacteria, cell, be hme t, be native t, primitive, ancestr, ecsystem, by the way, in fact, actually...