一篇英语课外阅读题Doyouknowsomethingabouttreerings(年轮)Doyouknowtheycantellusthattheweatherlike,sometimesevenhundredsofyearsago?Ayearwillgrowwellinaclimate(气候)withlotsofsunshineandrainfall(雨量)

　　一篇英语课外阅读题

　　Doyouknowsomethingabouttreerings(年轮)Doyouknowtheycantellusthattheweatherlike,sometimesevenhundredsofyearsago?

　　Ayearwillgrowwellinaclimate(气候)withlotsofsunshineandrainfall(雨量)Andlittlesunshineorrainfallwilllimit(限制)thegrowthofatree.Wecanseethechangeofclimatebystudyingthetreeringsofatreefromtheoutsidetotheinside.Ifthetenthringisfarfromtheeleventhring,thenwe’resurethatitwassunnyandrainymostofthatyear.Ifitisneartotheeleventhring,thentheclimatethatyearwasbad.

　　Treeringsareimportantnotonlyforstudyingthehistoryofweatherbutalsoforstudyingthehistoryofman.ManycenturiesagotherelivedalotofpeopleataplaceisNewMexico.Butnowyoucanfindonlysandthere---notreesandnopeople.Whathappened?

　　Ascientiststudiedtheringsofdeadtreesthere.Hefoundthatthepeoplehadtoleavebecausetheyhadcutdownallthetreestomakefiresandbuildings.Asallthetreeshadgone,thepeopletherehadtomove.

　　41.______ingoodclimate.

　　A.TreeringsgrowfarfromeachotherB.Treeringsbecomethinner

　　C.Treedon’tneedsunshineorrainfallD.Peoplecancutdownmostofthetrees

　　42.Thescientistsareinterestinginstudyingtreeringsbecausetreeringscantell____.A.whetheratreewasstrongornot

　　B.whetherpeopletookgoodcareofthetreesornot

　　C.whethertheclimatewasgoodornot

　　D.howoldthetreeswere

　　43.Ifyouwanttofindouttheweatheroftwentyyearsago,youshouldstudy____ofatreefromtheoutsidetotheinside.

　　A.thetwentiethringB.thetenthring

　　C.thenineteenthringD.thetwenty-firstring

　　44.Whydidpeopleusuallyliveinplaceswithlotsoftrees?

　　A.Treescouldtellthechangeoftheweather

　　B.Treesbroughtlotsofsunshineandrain

　　C.Treescouldmakeweathernottoohotortoocold

　　D.Treescouldbeusedforburningandforbuildinghouses

　　45.ThepeoplehadtoleavetheplaceinNewMexico______.

　　A.becausehadweatherstoppedthegrowthoftrees

　　B.becausetheynolongerhadwaterandthelandbecamesand

　　C.becausetheydidn’thaveenoughtreesforburning