《大学英语精读第四册教案u2》由会员分享，可在线阅读，更多相关《大学英语精读第四册教案u2（14页珍藏版）》请在金锄头文库上搜索。
1、Unit 2 Deer and the Energy Cycle Lead-in 1. Word Web Directions: What words will occur to you whenever we mention the word “energy”？ Write down as many words as possible about it.Before ReadingGlobal ReadingDetailed ReadingAfter ReadingWord Web Directions: What words will occur to you whenever we me
2、ntion the word “energy”？ Write down as many words as possible about it.ENERGYheatsolar energywindcoalgasoilatomic energynuclear energyenergy resourcesenergy crisisconservation of energy2. Warm-up Exercises Directions: Watch the video and write down the kinds of energy mentioned. Tips: flowing water,
3、 wind, fossil, solar, chemical reaction, nuclear MICRO-HYDRO: Small-scale systems tap the energy of flowing water. These are not to be confused with big dam projects which totally transform ecosystems, wreaking environmental havoc. WINDPOWER : An ancient source undergoing a revival with modern turbi
4、ne technology FOSSIL FUELS : Derived from long-dead organic and animal matter. Oil, coal, and natural gas are all fossil fuels. SOLAR ENERGY: The suns power can be harnessed in various ways: by using photovoltaic cells to generate electricity directly; by using thermal collectors to make steam to ge
5、nerate electricity; by using passive solar materials that maximize or retain the suns heat. BIOMASS: Biomass is vegetal or organic material including dung and plants and biofuels are the solid or liquid or gaseous fuels that derive from it. Wood, methane and alcohol are all biofuels. NUCLEAR ENERGY:
6、 Currently produced by “fission”. An atom is split using uranium and the heat produced drives steam turbines to generate electricity. 3. A Quiz 4. An English Song Directions: Listen to the song and fill in the blanks. Green, Green Grass of Home The old home town looks the same, As I step down from t
7、he train. And there to meet me is my mamma and my papa. Down the road I look, and there runs Mary, Hair of gold and lips like cherries ,Its good to touch the green green grass of home. Yes, theyll all come to meet me, Arms a-reachinsmiling sweetly ,Its good to touch the green, green grass of home.Th
8、e old house is still standing, Though the paint is cracked and dry, And theres that old oak tree, That I used to play on. Down the lane, Ill walk with my sweet Mary, Hair of gold and lips like cherries.Its good to touch the green, green grass of home.Then I awake and look around me, At the four gray
9、 walls that surround me, And I realize. Yes I was only dreaming , For theres a guard and theres a sad old padre,Arm in arm, well walk at daybreak, Again Ill touch the green, green grass of home.Yes theyll all come to see me in the shade of that old oak tree, As they lay me meet the green, green gras
10、s of home. Background Info 1. Deer Directions: Listen to the following passage，write down the words you think important, then retell the story according to what youve heard. There are about 100 different kinds of deer. Some live in grasslands. Others live in forests. The female deer becomes pregnant
11、 annually in late autumn, producing one to three young in late spring or early summer. The normal lifespan is 15 to 20 years. 2. Energy Crisis Directions: Listen to the following passage，write down the words youve heard. Energy crisis refers to a critical shortage in the supply of energy-producing f
12、uels, such as gas, oil, and coal. During the early 1970s, the demand for petroleum increased sharply, and Western countries depended heavily on imported supplies . The situation became worse during the Arab-Israeli War of 1973, when the Arab nations reduced to the United States and other countries t
13、hat supported Israel, causing an acute energy shortage in these countries during the winter of 1973 to 1974. 3. Ecological System (Ecosystem) Directions: Read the following passage and fill in the blanks with the help of the words given below. Effects, ecosystem, harmful insects, natural enemies, fa
14、ctors, drive away, farmland, lake, multiply A system is made up of a group of living organisms and their physical environment, and the relationship between them. A pond, a lake, a forest or an ocean may be an ecosysem . An ecosystem includes such factors as food supply, weather and natural enemies .
15、 Any change in environment has far-reaching effects on living things. The clearing of a forest, for example, may drive away birds and affect drainage (排水排水). Without birds to keep harmful insects under control, the insects multiply and may do serious damage to crops. Without trees to hold back rain
16、water, erosion may set in and ruin farmland. Scanning Directions: Scan the text and discuss in pairs, list the facts about the life of deer in four seasons. 1. summer: eat as much as they can, storing the excess in the form of fat; active in growing, reproducing or storing fat adult males: grow antlers and get fat adult females: give birth to young; produce milkfawns: become less dependent on their mother
