阅读理解Doyouwanttoknowsomethingaboutthehistoryofweather?Don'tlookatthesky.Don'tlookforoldweatherreports.Lookingattreeringsismoreimportant.Correctweatherreportsdatebackonlyonecenturybutso
阅读理解
Doyouwanttoknowsomethingaboutthehistoryofweather?Don'tlookatthesky.Don'tlookforoldweatherreports.Lookingattreeringsismoreimportant.Correctweatherreportsdatebackonlyonecenturybutsometreescanprovideanexactrecordoftheweatherevenfurtherback.
Itisnaturalthatatreewouldgrowbestinaclimatewithplentyofsunlightandrainfall.Itisalsoexpectedthatlittlesunlightorrainfallwouldlimitthegrowthofatree.Thechangefromafavorabletoanunfavorableclimatecanbedeterminedbyreadingthepatternofringsinatreetrunk.Tofindouttheweatheroftenyearsago，counttheringsofatreetrunkfromtheoutsidetotheinside.Ifthetenthringisfarfromtheotherringsthenitiscertainthatplentyofsunnyandrainyweatheroccurred.Iftheringsareclosetogetherthentheclimatewasbadforthetree.
Studyingtreeringsisimportantnotonlyforthehistoryofweatherbutalsoforthehistoryofman.InaregionofNewMexicoyoucanfindonlysand--notreesandnopeople.Howevermanycenturiesagoalargepopulationlivedthere.Theyleftsuddenly.Why?
Ascientiststudiedpatternsofdeadtreeringswhichhadgrownthere.Hedecidedthatthepeoplehadtoleavebecausetheyhadcutdownallthetrees.Treeswerenecessarytomakefiresandbuildings.Soafterthepeopledestroyedthetreestheyhadtomove.
Inthisinstancestudyingtreeringsuncoveredanexcitingfactaboutthehistoryofman.
1．Itisunderstoodthatinafavorableclimate_____.
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A．treeringsgrowclosetogether
B．treeringsgrowfarapart
C．treesinNewMexicowillgrowbigandtall
D．peoplecancutdownmostofthetreesinNewMexico
2．Whydidancientpeopleusuallylivewheretherewereplentyoftrees?
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A．Treesprovidedthemwithshades.
B．Treesindicatedplentyofsunlightandrainfall.
C．Treeswerematerialsforcookingandbuildinghouses.
D．Treesprovidedthemwithfruitandfood.
3．Scientistsareinterestedinstudyingtreeringsbecausetheycantell_____.
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A．alotaboutwhathappenedinhistory
B．whetheraparticulartreewashealthyornot
C．whetherpeopleto