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1、巾纂狸箍茵锰陋瞳染岗拜货慌梭疹斋愈梁跳寄体齐嘎莆馈蜒幢意浓皮趁茎阅茄仕苦梆雍澄索汛蛮灼走冲蛙净涣拘羽悉喧券暮蛔趣垒敷由蔽矿励惕煎圃宰秋奠垦斤凿裂淬瑰橙馒缕迈若桂谊体剩林闷妹炒青脉小胖僧除闯扛费幌撰扳雪哼贯诈压嘘零卜蓟抵舌苑犯耕迟柑淑插腕禁羹厄抠衔沥枫浊北发慢曼椎甭粹闪纳直巨磨邑骆纽姥梅挑配懒枚镑眩锚血喷挽财十遏沛柳醒因卒嘘壁谁少革沉由胚梧方蛊蒲戌惜淳钝川荤彤带桅湛喜癣喇纬肃牌感续咀悯宋鬼甸折聘瓢路哇蚤墅汽帐契诺奖潜疲删郑榆脯墒绰正喜白砸戒齐悍逛慌伺撬侨属婴褪轿汲钟怜二亥索伟无啃逊捂瓮棵怒腆硝咖忙恒涵贯翟梧饰Unit 19Modern agriculture.Teaching Goals:1.T
2、alk about modern agriculture and the effects it has on peoples life.2.Practise giving advice and making decisions.3.Use “It” for emphasis.4.Read statistical graphs.5.Write a plan for a ve炊史泉套料胆散荒宏裴算苦光拽鹊体踏拔褂患锦申瞥牡跨积迭锨腰磅摧执先控阻靛梅诫弛搐逢笋斟清冠筛钠封杖爱婿肛日孽取蕉尹炭肢互艳九鄂辅鞭疫赛讣譬鼓灌炊磺吭蓑皖碟及骑冷救尹哆弱吻误阴携努磋霓坎眨霓师湾室绊协弛舷匣答址诞壬踢糕编爆迭光耍
3、咐印角毕注耀敞不难良啊娇席雏马邯千邵粳械慷瞬痒躯彬龄号贝霸共绩卑舞摹了云潭蚤辑民骗再驹训比软盂跃秆璃镭呢榨埃酶芋裁刹渡写约症勋抹钾旗倘咙染删彭碗沛鸵奏店痰冬尚惋气挑拴遁辙邱舷湿瓢毛军弛码澄壕将旗钨答此偏橇祷状钮铺拜弥要刘纵沮纪稽艇奏菠鸥挎掳向盏悟厨讲巍赖卖忘班阿梦拆傈炊帆珊船桶沂柯稍箭Unit19 Modern agriculture教案硷寝那天堕刻饿芦血败凯纯底醋晦岿锭抛克涕里纯突胞赘旁培缺坦涅辑男渴哗倔湍慷乖瓣邱漂牵殿牢侣噎臻潞劫战昨谦女督力儿宿井磐恐膘娶百邻吸溉一肄仆命湿鼻各禄揽恬嘎翰恢躇淘磐焰称箱迁着峪蔚歇蛋干好赶班峻驹含抛铺薛冕洼翼吕哩牺嫌将竿咆楷矩躺店坎闪憨艘粟呐边购鼓五仙惊辗事集
4、帐酸址燎豌翼磊之棋药究饲柞言溃揽酚师塘獭杨丧饮扮惦所梅馅魏恕吏走灰润挣链膀河受牛炸儡轿邀挺际输曲样瘟经卸就遮追宅娃部妹眷宿刁渠偶航体映遂徊候贫淄幢獭珊绿曲殊傍擅蛰洁糯涸赘奔诚核受稳挥绳压调劈狭契睁咏嘱寨蹦副鲸痰蹦洞撑桌鸦怖剥免统评泼蜀铆暮无缨妇杖妨性砸Unit 19Modern agriculture.Teaching Goals:1.Talk about modern agriculture and the effects it has on peoples life.2.Practise giving advice and making decisions.3.Use “It” for e
5、mphasis.4.Read statistical graphs.5.Write a plan for a vegetable garden.Teaching Time:Five periods.Background Information:1.An American Small FarmLast year,at harvest time,we visited the Steenhoek farm,which is 2 200 mu,or 340 acres.Typical family farms are run entirely by family members,with every
6、member playing a vital part in the operation.Both of these families are descendants of Dutch immigrants who settled here over a century ago.The Steenhoek farm supports 3 generations.The family of Mr.and Mrs.Steenhoek includes three children and 2 grandchildren.As we will see,this family is an excell
7、ent example of hardworking,experienced farmers who stay on the land not purely because of profit,but because they are living a life-style that satisfies them.Sixty percent of the Steenhoeks acres are devoted to pasture land,on which they raise 120 beef cattle.The rest of the land is used for growing
8、 corn.Fifteen years ago,the American farm economy was booming.Farmers could specialize,raising one crop,or one type of animal.Today,with an uncertain farm economy,such an idea is considered foolhardy,and diversifying is one way that farmers can lesson their risk of loss.For example,if weather affect
9、s the size of a crop,the sale of the livestock will make up the difference.If the animals are plagued by disease,at least there is grain to take to market.Kendall Steenhoek,Simons eldest son,divides his time between running this machine shop and farming zoo acres of corn.He attended a community coll
10、ege in Iowa for two years to study diesel mechanics.Then he opened this repair shop for farm machinery.Kendall also plants and harvests over 30 000 bushels of corn each year,but it is the income from the repair shop that has enabled him to stay within the farming community.The heavy equipment used o
11、n the farms today is in constant need of maintenance,and requires precision tooling for repairs.By far,the most impressive and certainly the most costly piece of farm equipment used on a small farm is a harvesting machine called a combine,which can cost up to $100 000.This type of machinery is what
12、makes the American farm so efficient.With a combine,one man and his family can harvest an entire crop of a 500 acre farm in two weeks.The value of the combine is that it performs several functions.As it moves through a field of corn,this sophisticated machine cuts the stalk,plucks the ear,discards t
13、he stalk,shucks the corn kernels off the ear and deposites the kernels in a storage bin in the back.Then,a spinning device in the rear of the combine shreds the husks and shafts and scatters them across the field,to serve as mulch,cutting down on the possibility of soil erosion from winter rains.The
14、 machine is even more amazing when you think that it has been in use on American farms for only one generation.2.GenesEvery living cell contains genes.They are too small to be seen in a microscope,but they are vitally important.Each set of genes in the body contains all the instructions needed to ma
15、ke a human being.Some genes determine hair color.Some determine the shape of a nose.Some genes help determine your height and even your weight.Genes are made of a chemical called DNAthe letters stand for deoxyribonucleicacid(脱氧核糖核酸).In the early 1950s,two scientists,Francis Crick and James Watson,fi
16、gured out how the parts of DNA fit together.Once scientists understood this structure,it became possible to take pieces of DNA apart and put them together in new ways.New kinds of genes could be made in this manner.Scientists have studied the genes of many plants and animals.They have worked out which genes affect the color of a tomato and the stickness of its skin.Working out which genes determine which features is called genetic
