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1、Unit 4 Astronomy：the science of the stars,Astronomy is a natural science that deals with the study of celestial objects (such as moons, planets, stars, nebulae(曙光星云), and galaxies); physics, chemistry, mathematics, and evolution of such objects; and phenomena that originate outside the atmosphere of
2、 Earth (such as supernovae explosions, gamma ray bursts, and cosmic background radiation). A related but distinct subject, cosmology, is concerned with studying the universe as a whole.,Astronomy is one of the oldest sciences. Prehistoric cultures left behind astronomical artifacts such as the Egypt
3、ian monuments and Nubian monuments, and early civilizations such as the Babylonians, Greeks, Chinese, Indians, Iranians and Maya performed methodical observations of the night sky. However, the invention of the telescope was required before astronomy was able to develop into a modern science. Histor
4、ically, astronomy has included disciplines as diverse as astrometry, celestial navigation, observational astronomy, and the making of calendars, but professional astronomy is nowadays often considered to be synonymous with astrophysics.,During the 20th century, the field of professional astronomy sp
5、lit into observational and theoretical branches. Observational astronomy is focused on acquiring data from observations of astronomical objects, which is then analyzed using basic principles of physics. Theoretical astronomy is oriented towards the development of computer or analytical models to des
6、cribe astronomical objects and phenomena. The two fields complement each other, with theoretical astronomy seeking to explain the observational results, and observations being used to confirm theoretical results.,Notes： celestial slestl adj.天的，天空的n天人，神仙；(指封建时代的)中国人，天朝之人 cosmology kzmldi n宇宙学 methodi
7、cal midikl adj.有方法的；有条不紊的；井然,Read the passage carefully and judge the following sentences true(T) or false(F) 1Astronomy is only used for the study of stars. ( ) 2The oldest sciences include astronomy and others. ( ) 3The field of professional astronomy was split into observational and theoretical b
8、ranches. ( ) 4Theoretical results need to be tested by the facts. ( ) 答案 1.F 2.T 3.T 4.T,Unit 4 Astronomy：the science of the stars Section Warming Up & Reading 课件（人教版必修3，课标通用）,.阅读理解(根据Reading内容选择答案) 1What began to appear on the earths surface when it cooled down?AWater. BGases.CAcids. DCarbon. 2From
9、 the last paragraph we can infer that the author is _. Aconfident BsadCconcerned Dangry,3What does the word “they” refer to in the sentences “It exploded loudly with fire and rock.They were in time to produce carbon, nitrogen, water vapour and.”？APlanets. BStars.CGases. DFire and rock. 4Which is the
10、 right order of the development of life?ASmall clever animalsshellfishdinosaursmammals.BShellfishdinosaurssmall clever animalsmammals.CShellfishdinosaursmammalssmall clever animals.DDinosaursshellfishmammalssmall clever animals.,5Why were mammals different from other life forms?ABecause they gave bi
11、rth to young baby animals and produced milk to feed them.BBecause they produced young generally by laying eggs.CBecause they were able to live on land as well as in the water.DBecause they lived on grass.答案 1.A 2.C 3.D 4.C 5.A,.短文填词(根据Reading内容完成短文)As the result of “Big Bang”， the violent earth slow
12、ly settled into a globe _1_ (move) around the sun. The gases which were to make the earths _2_ (大气层)came into being from the explosion of the dust ball, with water _3_ (follow) them while the earth cooled down. It allowed the beginning of life. Many millions of years _4_， the first _5_ (极度的) small p
13、lants began to appear _6_ the surface of the water，_7_ (繁殖) and filling the seas and oceans, which encouraged the later development of early shellfish and all sorts of fish.,As time passed, green plants taking in carbon dioxide and producing _8_(氧气)came to land and grew into forest. Later the chains
14、 of lives continued, such as insects, amphibians, reptiles, dinosaurs and mammals, the typical of _9_ is human being. They dont only do _10_ to the earth but cause damage to it. 答案 1.moving 2.atmosphere 3.following 4.later 5extremely 6.on 7.multiplying 8.oxygen 9.which 10.good,.阅读表达(根据Reading内容完成下列各
15、题) 1Whats the main idea of the text? (Please answer within 20 words.)_ 2Why was the earth different from the other planets？(Please answer within 10 words.)_ 3Why did the dinosaurs disappear suddenly? (Please answer within 10 words.)_,4Whats the relation between the plants and animals? (Please answer
16、 within 10 words.)_ 5What problems have been caused by humans to the earth? (Please answer within 10 words.)_答案 1.The text mainly tells us the formation of the earth and the development of life on it. 2.Because there is water on the earth. 3.No one knows that, and it remains a mystery. 4.They depend on each other. 5.The earth is becoming warmer and warmer.,
