sea stories多媒体教学课件.pptVIP

1、“大树底下好乘凉”从植物的生理功能看，主要是因为（）A．蒸腾作用吸收热能B．光合作用吸收热能C．呼吸作用释放热能D．渗透作用吸收热能2、把洋葱表皮细胞放入1MKNO3溶液中，开始时发生质壁分离，尔后自动复原，为什么？答：表皮细胞在失水的同时，矿质离子被吸收，导致外界溶液浓度降低，小于细胞液浓度，细胞吸水而发生质壁分离复原。课堂练习首页4、将等量的NH4+、PO43-、K+、Ca2+共同置于500mL水中，再放入一些新鲜的水稻根尖，几小时后，测定混合液中上述四种离子和水的含量变化如下：项目H2O、NH4+、K+、Ca2+、PO43-的减少量0%、83%、72%、97%、84%下列分析与解释正确的是 （）①离子大量减少而水却没有减少，说明根对水分的吸收和对矿质离子的吸收是两个相对独立的过程②四种离子都减少，说明根对这些离子都有吸收③根对四种离子的吸收量有差异，说明根对离子的吸收具有选择性④Ca2+比K+明显减少，说明水稻根细胞膜上运输Ca2+的载体比运输K+的载体多A．①② B．①③ C．②③ D．都正确3、盛花期的连续暴雨影响了大田油菜正常授粉，防止减产的补救措施（）A．喷施硼肥 B．追施氮肥C．喷施一定浓度的生长素类似物溶液 D．均不可取首页Titanic未来水世界钢琴别恋金银岛Lesson4SeaStoriesWhatwillthetitleremindyouof?tsunami,seismicseawave海啸tsunami,seismicseawave海啸whirlpoolLookattheKeyWordsandfindtheminthepictures.barrel,cloud,fisherman,fishingboat,moon,wave,whirlpoolReadtolearn

ReadingStrategies:SequencingLookatthepicturesanddecidewhichshowsthebeginning,middleandendofthestory.Readeachparagraph.Payattentiontothelinkingwords.Theyoftenhelpyoudecidetheorderofevents,e.g.oneday,suddenly,intheend.Decideapossibleorderfortheparagraphs.Readtheminthatordertoseeifthestorymakessense.有意义，能理解；合理，有道理，讲得通Ex.4Readthestoryagainandanswerthesequestions.1.Whydidthewriter’syoungerbrotherfallintothesea?(Para.B,inthemiddle)Hefelloverboardbecauseanenormouswavecoveredtheirboat.2.Whydidtheboatgotowardsthewhirlpool?(attheendofPara.B)Withthewindandwavestheboatwenttowardsthewhirlpool.3.Whydidthewritertiehimselftoabarrel?(Online11inPara.A)Hetiedhimselftoabarreltohelphimfloatbecausehenoticedthattheheavierobjectswentdownmorequicklythanthesmaller,lighterones.______4.Whydidn’thisbrotherdothesame(AttheendofPara.A)Hisbrotherdidn’tt