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1、Unit3[A]1.由生物多样性的丧失而引起的对人类和地球的威胁和由气候变化所带來的危险一•样大。Thethreattohumanityandtheplanetposedbybiodiversitylossisasgreatasthedangerspresentedbyclimatechange・2.收到年轻读者表达他们对被囚动物的关心的信，并询问他们能帮助做什么，我们总是很高兴。Wearealwayshappytohearfromyoungreadersexpressingconcernforanimalsincaptivityandaskingw
2、hattheycandotohelp.3.这两个最盛行的理论都认为恐龙之所以灭绝是因为地球人气和温度的变化而造成的。Thetwomostpopulartheoriesbothsaythatdinosaursdiedoutbecauseofchangesintheearth'satmosphereandtemperature・4.这场森林大火最终被消防队所控制住了，花费将近50万美元。Theforestfirewasfinallybroughtundercontrolbythefire-fightingcrewsatacostofnearlyhalfa
3、milliondollars.5.植物根茎能够固定土壤，使Z不会被雨水冲蚀。Plantrootscanholdthesoilinpositionandpreventitfrombeingwashedawaybytherainwater.6.健康的主态系统以能源、营养物质、有机物质和水的可持续更替为特点。Healthyecosystemsarccharacterizedbysustainableturnoversofenergy,nutrients,organicmatterandwater.7.在世界野生动物基金会一份新的报告中，科学家警告说全球变暖
4、可能在今后20年中灭绝北极熊。InanewreportbytheWWF,scientistshavewarnedthatglobalwarmingcouldkilloffpolarbearswithinthenext20years・8.犁过的地对流水没有防范能力，因而珍贵的表土常常在大雨和洪水中被冲走。Plowedfieldsdon'thaveanyprotectionagainstrunningwater,andoftenthevaluabletopsoiliscarriedawayduringheavyrainsorfloods.9.这个花园比前
5、两天要安静多了，但周围还是有很多各式各样的鸟。Thegardenwasconsiderablyquieterthanithadbeentheprevioustwodays,buttherewerestillagoodvarietyofbirdsaround・10.尽管有不同的预计，但总体上人们认为用于制作现代药站的活性成分有大约30%到40%是从植物中提取的，或同植物冇关。Whileestimatesdiffer,itisgenerallybelievedthataround30%-40%oftheactiveingredientsusedinmod
6、ernmedicinesarederivedfrom,orrelatedto,plants.[BJOneofthesereasonsisthateachlife-formoccupiesaspecialplacewithinitsecosystem一thatis,itscommunityofplantandanimallife,incombinationwiththenonlivingcomponentsofitsenvironmentsuchastheclimate,soil,water,andai匚Forinstance,withinafores
7、tthelargertreesdropofflittletwigsanddebris,makingalayerthatholdswaterinthesoilforotherplantstouse.Therootsholdthesoilandpreventitfromwashingawayinrainstorms.Whetherlivingordead,thetreeprovidesshelterforanimalsandbirdsandfoodforinsects・Asthedeadtreerotsaway,itenrichesthesoilofth
8、eforestfloor,enablingotherplantstospringupinitsplace・S
