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1、http://bailiedu.com托福阅读TPO1题目解析TPO是托福备考圣经,但是并不是有“圣经”就能完全把握托福考试。还要看大家怎么去利用这份资料。针对原文,我们可以最大限度的剖析再剖析。直到把文章掌握得滚瓜烂熟。而大家又是怎样对待其中的每个考题呢?是做完对对答案,记下答对率;还是认真分析每个考题在考什么,找出托福阅读的“点”在哪?前者居多吧!所以关于托福阅读TPO,小编希望最大限度地利用这些ETS提供的阅读题目。在题目中,找到每个题目考察点,给出最全最有逻辑的解析。今天,小编分享给大家的是关于TPO1TimberlineVege
2、tationonMountains的题目分析。TimberlineVegetationonMountains山上树带界线的植被1.Thetransitionfromforesttotreelesstundraonamountainslopeisoftenadramaticone.Withinaverticaldistanceofjustafewtensofmeters,treesdisappearasalife-formandarereplacedbylowshrubs,herbs,andgrasses.Thisrapidzoneoftr
3、ansitioniscalledtheuppertimberlineortreeline.Inmanysemiaridareasthereisalsoalowertimberlinewheretheforestpassesintosteppeordesertatitsloweredge,usuallybecauseofalackofmoisture.2.Theuppertimberline,likethesnowline,ishighestinthetropicsandlowestinthePolarRegions.Itrangesfro
4、msealevelinthePolarRegionsto4,500metersinthedrysubtropicsand3,500-4,500metersinthemoisttropics.Timberlinetreesarenormallyevergreens,suggestingthatthesehavesomeadvantageoverdeciduoustrees(thosethatlosetheirleaves)intheextremeenvironmentsoftheuppertimberline.Therearesomeare
5、as,however,wherebroadleafdeciduoustreesformthetimberline.Speciesofbirch,forexample,mayoccuratthetimberlineinpartsoftheHimalayas.3.Attheuppertimberlinethetreesbegintobecometwistedanddeformed.Thisisparticularlytruefortreesinthemiddleandupperlatitudes,whichtendtoattaingreate
6、rheightsonridges,whereasinthetropicsthetreesreachtheirgreaterheightsinthevalleys.Thisisbecausemiddle-andupper-latitudetimberlinesarestronglyinfluencedhttp://bailiedu.combythedurationanddepthofthesnowcover.Asthesnowisdeeperandlastslongerinthevalleys,treestendtoattaingreate
7、rheightsontheridges,eventhoughtheyaremoreexposedtohigh-velocitywindsandpoor,thinsoilsthere.Inthetropics,thevalleysappeartobemorefavorablebecausetheyarelesspronetodryout,theyhavelessfrost,andtheyhavedeepersoils.4.Thereisstillnouniversallyagreed-onexplanationforwhythereshou
8、ldbesuchadramaticcessationoftreegrowthattheuppertimberline.Variousenvironmentalfactorsmayplayaro