About____ofthewateronEarthis“fresh”water.Watercoversabout_______oftheEarth.WorldWaterDay？March22nd（3月22日）3%71%QuestionsUnit5WaterPart1Vocabularydropn.滴一滴水adropofwaterv.掉下Idroppedmyglasses.dropfall表示从高处往下掉或降，有时可互换。Hedropped/fellfromthetopofthehouse.drop一般指无意的行为，意外Tearsdroppedfromhereyes.Thetemperaturesuddenlydroppedtozero.fall落下，掉落。在重力作用下，有自然坠落之意。Anapplefelltotheground.SnowoftenfallsinShenyanginwinter.drop做名词讲，通常指液体adropofwaterdropsofrain•fallasleep睡着•falldown摔倒•fallinlovewithsb.爱上•fallintopieces碎成许多片•fallbehind落后继续做某事continuedoingcontinuetodo做同一件事(中断后)接着做另外一件事continuev.继续（keepdoingsthwithoutstopping）Shelookedaround,thencontinueddrawing.Hecontinuedtoworkthere.freshair新鲜空气freshblood新成员、新血液freshwater淡水freshadj.淡的，无盐的，新鲜的throughprep.通过、穿过辨析：cross,across,throughChemicaln.化学品（chemicals）Chemistryn.化学Valuable=usefulandimportantadj.有价值的，宝贵的这对我来说是宝贵的一课。Itisavaluablelessonforme.quantityn.数量(不可数)；数目；数额（可数）1.quantity如果指具体的数量，为可数名词，可连用不定冠词或用复数形式;Heateasmallquantityofrice.Quantitiesoffoodwereonthetable.Itismuchcheaperifyoubuyitinlargequantities.asmall/largequantityof小量的…/大量的…可接可数或不可数名词2.quantity指相对于质量来说的“数量”，为不可数名词。例句：We'vealwaysputqualitybeforequantity.我们总是认为质量比数量重要。experiment(s)n.实验do/makeanexperimenton…v.试验、实验experimentonsthabitof修饰不可数名词（用法同alittle)abitofmoneyabitofwork一点钱一点工作abit有点,一点（修饰形容词）eg.abittiredbank银行hangen.零钱(不可数名词）扩展：change表示变化时是可数名词e.g.Greatchangeshavetakenplaceinthisplace.voice嗓音说话声inaloud/lowvoice辨析：voice,sound,noiceHereturnedthebooktoyouyesterday.return返回=comeback=gobackreturnv.归还=givebackn.回报inreturnfor…作为…的回报dropjourneyquantityexperimentvoicereservoirchemicalpipebit旅程实验水库化学品一点管道说话声滴、落下数量Par...
