Unit41.accordingto根据，依据…而定1.tobeginwith以…开始2.intimetodo及时做某事3.cooldown冷却下来4.befundamentalto对…很重要5.allowsbtodosth/allowdoingsth允许某人做某事/允许某事6.beharmfultosb/sth对某人/某事有害7.dissolvesthintosth把…溶解在…之中8.achainreaction连锁反应9.fillsthwithsth用…填充…10.aswellas(除了…之外)也…11.forthefirsttime第一次12.layeggs下蛋13.givebirthto分娩14.inone’sturn轮到某人；接着15.prevent…from阻止，制止16.asaresult结果17.dependon依赖，依靠18.fallfromatreetotheground从树上摔下到地上19.befarfrom…远远不，一点也不20.cheerup感到高兴，感到振奋21.nowthat既然…22.afterawhile一会之后23.getthehangofsth掌握，理解24.breakout（疾病、战争、火灾）爆发、突发25.Pleasecheckthat…请核实,请检查…26.Watchoutfor…小心…27.hangout闲逛；连晒衣服28.giveout分发；发出（光，热…）29.warn(sb)of/aboutsth提醒某人某事=remindsbofsth30.warnsb(not)todo警告某人（不）去做某事31.anewapproachtosolvingtheproblem/anewwaytosolvetheproblem一个解决这个问题的新方法32.feedAonB用B喂A33.goout（灯、火）熄灭putsthout熄灭…34.godry变得干燥35.Thereisnoescape.逃不掉了。haveanarrowescape幸免于难36.Accordingtoawidelyacceptedtheory,theuniversebeganwitha“BigBang”thatthrewmatterinalldirections.一种普遍为人们所接受的理论是：宇宙起源于一次大爆炸，这次大爆炸将物质投射到四面八方。37.Whatitwastobecomewasuncertainuntilltheageofthedinosaurs.随后它会变成什么没人能知道，直到到了恐龙时代。38.Whatisevenmoreimportantisthatastheearthcooleddown,waterbegantoappearonitssurface.更为重要的是，当地球冷却下来的时候，水开始在它的表面形成了。39.Itwasnotimmediatelyobviousthatwaterwastobefundamentaltothedevelopmentoflife.水对于生命的发展会起关键作用，这一点在当时并不明显。40.Whytheysuddenlydisappearedstillremainsamystery.它们为什么突然灭绝，至今仍是个迷。41.Theyareputtingtoomuchcarbondioxideintotheatmosphere,whichpreventsheatfromescapingfromtheearthintospace.人类把大量的二氧化碳排放到大气中去，这使得地球上的热不能释放到太空中去。42.Sowhetherlifewillcontinueontheearthformillionsofyearstocomewilldependonwhetherthisproblemcanbesolved.所以，生命能否在未来的几百万年后在地球上延续取决于这个问题能否被解决。43.Nooneknowsexactlyhowtheearthbegan,asithappenedsolongago.44.haveaviolenttemper45.watchaviolentfilm46.intheory47.inpractice48.reacttosth49.multiply2by350.therefore=thus=accordingly1
