Unit7Section+A+1a-1c 人教版八年级英语下册

Unit7What’sthehighestmountainintheworld?SectionA1a-1cnewwordsandphrasessquaren.metern.deepadjdesertn.平方，正方形米，公尺深的，纵深的沙漠eightthousandeighthundredandforty-eightpointeightsixmetershigh.thehighestmountainintheworldsixthousandsixhundredandseventy-onekilometerslongthelongestriverintheworldonethousandandtwenty-fivemetersdeepthedeepestsaltlakeintheworldtheSaharaaboutninemillionsixhundredthousandsquarekilometersinsizethebiggestdesertintheworld拼读千位以上的基数词从个位起每隔三位加一逗号，依次添加thousand，million，billion，其中的每三位数仍按百位数读。例如:9,999,999,999ninebillionninehundredandninety-ninemilionninehundredandninety-ninethousandninehundredandninety-nine.表示具体数目(确数)时hundred，thousand和million须用单数。eightthousandeighthundredandforty-eightonethousandandtwenty-fivesixthousandsixhundredandseventy-oneninemillionsixhundredthousand9,600,0008,8481,0256,671Matchthefollowingnumbers小数英语表示法

小数用基数词来表示,以小数点为界,小数点左首的数字为一个单位,表示整数,数字合起来读;小数点右首的数字为一个单位,表示小数,数字分开来读;小数点读作point,o读作zero或o.0.4------zeropointfour或pointfour零点四10.23-----tenpointtwothree十点一三25.67-----twenty-fivepointsixseven二十五点六七1.03------onepointothree一点零三

形容词比较级和最高级的构成规则变化a.一般情况下，单音节或双音节的形容词比较级直接加-er,最高级直接加-est。b.以-e结尾的形容词，比较级+-r,最高级+-st。c.以辅音字母+y结尾的形容词，变y为i+er或+est。

d.以重读闭音节结尾，末尾只有一个辅音字母结尾的词，双写最后一个辅音字母，再加+er或+est。e.多音节和部分双音节形容词，需在原级前+more

构成比较级，+most构成最高级。

不规则变化原级比较级最高级good/wellbetterbestbad/illworseworstlittlelessleastmany/muchmoremostfarfarther/furtherfarthest/furthestoldolder/elderoldest/eldestPresentationA:What’sthehighestmountainintheworld?B:QomolangmaPresentationA:What’sthedeepestseaintheworld?B:TheCaspianSeaPresentationA:What’sthelongestriverintheworld?B:TheNile.PresentationA:What’sthebiggestdesertintheworld?B:TheSahara.用比较级表示最高级最高级：Qomolangmaisthehighestmountainintheworld.Qomolangmaisthehighestmountainofallthemountains.比较级：Qomolangmaishigherthantheothermountainsintheworld.Qomolangmaishigherthananyothermountainintheworld.最高级常用结构the+最高级(+单数名词)+in/of.......

是......中最....·的Jimisthetallest(student)inhisclass.吉姆是班上最高的。Ijump(the)farthestofallthe

studentsinourclass.我是我们班跳得最远的。最高级常用结构oneofthe+形容词最高级+可数名词复数+in/of...最......的之一Beijingisoneofthe

oldest

cities

in

China.北京是中国最古老的城市之一。Jimisoneofmybestfriendsjim是我最好的朋友之一。最高级常用结构the+序数词+形容词最高级

第几最.....TheYellowRiveristhesecondlongestriverinChina.黄河是中国第二长河。Matchthefactsyouknow.1aQomolangmaabout9,600,000squarekilometersinsizeTheSahara1,025metersdeepTheCaspianSea6,671kilometerslongTheNile8,844.43metershighListenandcompletethesentences.1.Qomolangmais________thananyothermountainintheworld.2.TheSaharais_________desertinth