搜题，就来丰阳塔题库【问题】 TheArctic'spermafrostisinciting-andfast.That'sbadnews，becausethesefrozensoilsstorebillionsoftonsofcarbon，justwaitingtobereleased.Soisthereawaytosavethepermafrost？Oneteamofresearchersthinksitmayhavefoundapossiblesolution：biganimals，herbivores-animalsthatea
TheArctic'spermafrostisinciting-andfast.That'sbadnews，becausethesefrozensoilsstorebillionsoftonsofcarbon，justwaitingtobereleased.Soisthereawaytosavethepermafrost？Oneteamofresearchersthinksitmayhavefoundapossiblesolution：biganimals，herbivores-animalsthateatonlyplants. Backin1996researchersstartedanexperimentcalledPleistocenePark.TheyfencedinabouteightsquaremilesoflandinnortheastSiberia.Thentheyintroduceddifferenttypesofherbivores：reindeer，horses，bison，sheepandotherlargecreatures. Sincethen，scientistshavestudiedtheseanimals'effectsontheecosystem.Oneoutcomeisthattheselargeherbivoreshelpkeepthegroundverycold-coolerthanitwouldotherwisebe. "Thesnowinwinterisimportantforsoiltemperature，becauseitactsasaninsulatinglayer.Sotheairinwinter，atthehighlatitudes，ismuchcolderthanthesoil."PhilippPorada，avegetationecologistattheUniversityofHamburg."Sotheideaofthisexperimentwastointroducelargeherbivores-andtoquantifytheireffectsonsoiltemperaturetoseeiftheycanactuallyprotectpermafrostsoilsagainstmelting.Andthisworksbecauseoftheanimals'trampling（践踏），andthisleadstolessinsulationofthesoilagainstcoldairtemperaturesandresultsinacoolingeffect." Poradaandhiscolleaguesrealizedthesignificanceofthiseffect，sotheypulleddatafromPleistoceneParkandSwedentomodelwhateffectherbivorescouldhaveonpermafrostiftheylivedinlargenumbersintheArctic. Poradasaid，"Theseherbivoresinthemodelreducesoiltemperaturesubstantially，by1.7degreesonaverage.Andthisleadstoapreservationofaround80percentoftheoriginal-today'spermafrostarea.Withouttheherbivoreeffectinthemodel，only50percentofthepermafrostareawouldremainbytheyear2100."（1）Whatwillthepermafrost'smeltingresultin？ ______A.Thedecreaseair.B.Thecoolingeffect.C.Therisethesurroundingtemperature.D.Theincreaseinherbivores.（2）Whycantheherbivoreshelpkeepthegroundcooler？ ______A.Theycanmakemoreinsulatinglayers.B.Theycanprotectthesnowontheground.C.Theymakethegroundreleaselotsofcarbon.D.Theymakecoldairreachthesoilmoreeasily.（3）HowdidPoradafeelaboutthefindingoftheexperiment？ ______A.Itremainstobechecked.B.It'sunreasonable.C.It'ssignificant.D.Ithasbeenusedwidely.（4）WhatdidPoradaintendtotellusinthelastparagraph？ ______A.Theherbivorescouldleadtothepreservationofpermafrost.B.Theherbivoreswouldhelpfindmorepermafrostareas.C.Thetemperaturewouldincreasegreatlyinthefuture.D.Onlyhalfofthepermafrostwouldremainbytheyear2100.
正确答案：（1）C.细节理解题。根据第一段中" The Arctic's permafrost is inciting- and fast.That's bad news，because these frozen soils store billions of tons of carbon，just waiting t
题目解析：
这是一篇说明文。永久冻土正在快速融化，释放的二氧化碳会导致周围温度的上升，研究人员发现食草动物可能会使得永久冻土得以保存。
点评：
阅读理解解题步骤：首先对原文材料迅速浏览，掌握全文的主旨大意。因为阅读理解题一般没有标题，所以，速读全文，抓住中心主旨很有必要，在速读的过程中，应尽可能多地捕获信息材料。
其次，细读题材，各个击破。掌握全文的大意之后，细细阅读每篇材料后的问题，弄清每题要求后，带着问题，再回到原文中去寻找、捕获有关信息。
要善于抓住每段的主题句，阅读时，要有较强的针对性。对于捕获到的信息，要做认真分析，仔细推敲，理解透彻，只有这样，针对题目要求，才能做到稳、准。
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