仁爱版九年级上册英语Unit4 Topic2 SectionC 学案 (无答案）.doc

Unit4Topic2SectionC精品学案一、预习热身。翻译：A:benamedafterMars_____________________atadistanceof...______________________53%aswideas...____________________two-fifthsasstrongas...____________________beclosesttoeachother____________________searchformoreinformation_________________B:OnthesurfaceofMars__________________weightonly36kilos____________________theRomangodofwar____C:Itsdiameteris53％aswideasthatoftheearth.._______________________________________IthasbeentwodayssincewelandedonMars._________________________________________二、重难点释疑。Itsdiameteris53％aswideasthatoftheearth..它的直径是地球直径的53％。点拨：as﹢形容词/副词原级﹢as﹢名词像…一样…。思考：句中that指代______________如果前面的名词是复数用_________指代。练习：a.我们学校像花园一样美。Ourschoolis__________________________apark.b.Tom和Mike跑得一样快。Tom______________________________Mike.c.城市的楼比农村的高。Thebuildingsinthecity_________________than_________inthecountry.Marsgoesaroundthesunatadistanceofabout228millionkilometers.火星在相距大约两亿两千八百万千米的地方绕着太阳旋转。点拨:atadistanceof相隔…。拓展：at/fromadistance在远处。ThegravityonthesurfaceofMarsisabouttwo-fifthsasstrongasitisonearth.火星表面的引力大约是地球表面引力的五分之二。点拨：倍数词/分数/百分数﹢as﹢形容词或副词原级﹢as“是…的几倍/几分之几/百分之几”。练习：a.这个盒子是那个盒子的四倍重。Thisboxis______________________________thatbox.b.这个房间是那个房间的三分之一大。Thisroomis____________________________thatroom.Soapersonwhoweighs90kilosonearthweighsonly36kilosonMars.因此一个在地球上重90千克的人在火星上只有36千克的重量。点拨：apersonwhoweighs90kilosonearth一个重达90公斤的人思考：句中第一个weighs是___句的_________________;第二个weighs是___句的____________________5.IttakesaspaceshipabouteightmonthstoreachMarsfromtheearthwhenthetwoplanetsareclosesttoeachother.在地球与火星最接近的时候宇宙飞船需要用大约8个月的时间才能从地球到达火星。同义句：Aspaceship________________________________________Marsfromtheearthwhen…点拨：beclosestto…离…最近。拓展：离…近__________________;离…远_________________。6.Scientistsarestillsea