2014年12月英语四级阅读冲刺练习及答案(3)思维导图
Trees should only be pruned when there is a good and clear reason for doing so and , fortunately,the number of such reasons is small. Pruning involves the cutting away of obergrow
树图思维导图提供 2014年12月英语四级阅读冲刺练习及答案(3) 在线思维导图免费制作，点击“编辑”按钮，可对 2014年12月英语四级阅读冲刺练习及答案(3) 进行在线思维导图编辑，本思维导图属于思维导图模板主题，文件编号是：e098d40a9de2d1549d9353c13efa6f11
思维导图大纲
2014年12月英语四级阅读冲刺练习及答案(3)思维导图模板大纲
Treesshouldonlybeprunedwhenthereisagoodandclearreasonfordoingsoand,fortunately,thenumberofsuchreasonsissmall.Pruninginvolvesthecuttingawayofobergrownandunwantedbranches,andtheinexperiencedgardenercanbeencouragedbythethoughtthatmoredamageresultsfromdoingitunnecessarilythanfromleavingthetreetogrowinitsownway.
First,pruningmaybedonetomakesurethattreeshaveadesiredshapeorsize.Theobjectmaybetogetatreeoftherightheight,andatthesametimetohelpthegrowthofsmallsidebrancheswhichwillthickenitsappearanceorgiveitaspecialshape.Secondly,pruningmaybedonetomakethetreehealthier.Youmaycutdiseaedordeadwood,orbranchesthatarerubbingagainsteachotherandthuscausewounds.Thehealthofatreemaybeencouragedbyremovingbranchesthatareblockingupthecentreandsopreventingthefreemovementofair.
Oneresultofpruningisthatanopenwoundisleftonthetreeandthisprovidesaneasyentryfordisease,butitisawoundthatwillheal.Oftenthereisaracebetweenthehealingandthedeseaseastowhetherthetreewillliveordie,sothatthereisaperiodwhenthetreeisatrisk.Itshouldbetheaimofeverygardenertoreducewhichhasbeenprunedsmoothandclean,forhealingwillbesloweddownbyroughness.Youshouldallowthecutsurfacetodryforafewhursandthenpaintitwithoneofthesubstancesavailablefromgardenshopsproducedespeciallyforthispurpose.Pruningisusuallywithoutinterferencefromtheleavesandalsoitisveryunlikelythatthecutsyumakewillbleed.Ifthisdoeshappen,itis,ofcourse,impossibletopaintthemproperly.
1.Pruningshouldbedoneto______.
a.makethetreegrowtaller
b.improvetheshapeofthetree
c.getridofthesmallbranches
d.makethesmallbranchesthicker
2.Treesbecomeunhealthyifthegardener______.
a.allowstoomanybranchestogrowinthemiddle
b.doesnotprotectthemfromwind
c.forcesthemtogrowtooquickly
d.damagessomeofthesmallsidebranches
3.Whyisaspecialsubstancepaintedonthetree?
a.Tomakeawoundsmooth
b.Topreventdiseaseenteringawound
c.Tocoveraroughsurface
d.Tohelpawoundtodry
4.Agoodgardenerprunesatree______.
a.atintervalsthroughouttheyear
b.asquicklyaspossible
c.occasionallywhennecessary
d.regulareverywinter
5.Whatwastheauthor'spurposewhenwritingthispassage?
a.Togivepraticalinstructionforpruningatree.
b.Togiveageneraldescriptionofpruning
c.Toexplainhowtreesdevelopdiseases
d.Todiscussdifferentmethodsofpruning.
答案：babca
大学英语四六级考试CET46
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