小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com考前强化提速练Ⅰ.阅读理解Since1970，NorthAmericahaslostmorethan2.9billionbirds，accordingtoastudyrecentlypublishedinthejournalScience.Inlessthanhalfacentury，thebirdpopulationhasdeclinedbysome29percent，ormorethan1in4birds.Forthefirsttime，researchershavediscoveredthatrarespeciesaren’ttheonlybirdssufferingpopulationloss.Infact，commonbirds—includingbelovedbackyardfriendslikesparrowsandblackbirds—aretakingthebiggesthit.Thenewstudyusednearly50yearsofdatacollectedlargelybybirdwatchersandcitizenscientists.“Atotalof419nativemigratoryspeciesexperiencedanetlossof2.5billionindividuals，”thestudysays.Morethan90percentofthetotallosscanbefoundamongjust12birdfamilies.Someofthesewidespreadbirdscanthrivealmostanywhere.Thelargescalelossofthesehardybirdsrevealsthey’restrugglingtosurvivethroughouttheworld.Birdsareconsideredindicatorspeciesbecausethey’recrucialtoecosystems，andtheirpopulationsanticipatetheenvironment’shealth.Birdsare“amazinglyefficient”atspreadingseeds.Birdsalsokeepinsectpopulationsincheck.Eventhesmallestbirdhelpscontrolthespreadofplantsorinsects.Thenewstudy，however，identifiesthelosseswithoutknowingallthecauses.Scientistsdoidentifyhabitatlossasthebiggestchallenge.Climatechange，disruptedmigrationpatternsandpesticideusearealsomajorfactors.Industrialagriculturemaypresentabiggerchallenge.Thespeciesdisappearingmostrapidly—sparrows，blackbirdsandlarks—areassociatedwithagriculture.Inrecentdecades，agriculturehasgrowntoproducemorefood，butclearedlandscapeshavebecomeunlivableforbirds.“Weneedtochangethewaywegrowfood.Birdsaresignalingthatwearedoingitwrong，”asthestudysays.Thestudyofferstheexampleofthe1990sefforttoswitchtonotillfarming，whichreducedgreenhousegasesandsoilerosion(侵蚀)．“Farmersareinnovators.Andthey’vedoneitbefore.Thisisagreatopportunitytohaveahugeimpactonbirds.”语篇解读是一篇明文。文章主要介了一新的究，即普通的量和这说绍项研发现鸟类数锐减其背后的原因以及解方案。决1．What’sthestudymainlyabout?A．Theclimateissues.B．Thedisappearingbirds.C．Theagriculturalproblems.D．Theenvironmentalprotection.小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com答案B解析理解。根据文章第一段最后句可知，究人首次，珍稀物不是唯细节题两研员发现种并一遭受群失的。事上，普通的——包括像麻雀和黑的我后院的好朋种损鸟类实鸟类鸟这样们友——受到的害最大。由此可知，究主要是于正在消失的的。故伤这个研关鸟类选B。2．Howisthesecondparagraphmainlydeveloped?A．Bylistingfigures.B．Bygivingexamples.C．Byanalyzingreasons.D．Bymakingcomparisons.答案A解析理解。根据文章第二段中的细节题“Thenewstudyusednearly50yearsofdatacollectedlargelybybirdwatchersandcitizenscientists.‘Atotalof419nativemigratoryspeciesexperiencedanetlossof2.5billionindividuals，’thestudysays.Morethan90percentofthetotallosscanbefoundamongjust12birdfamilies.”可知，作者列了大量据介新究举数来绍该项研。故选A。3．What’sthemainreasonbehindthebirds’habitatloss?A．Climatechange.B．Greenhousegases.C．Industrialagriculture.D．Disruptedmigrationpatterns.答案C解析理解。根据文章第四段前句可知，量最重要的原因就是栖息细节题两鸟类数锐减鸟类地的少；合本段最后一句中的减结“agriculturehasgrowntoproducemorefood，butclearedlandscapeshavebecomeunlivableforbirds”可知，了生更多的粮食，...