2017年6月大学英语四级考试阅读理解每日一练（7）思维导图
距离2017年6月大学英语四级考试还有一个半月的时间，已经报名的同学备考一定要抓紧，不要临时抱佛脚。新东方网英语四级频道为大家整理了英语四级阅读理解每日一练，每天一道题考试不担心。
树图思维导图提供 2017年6月大学英语四级考试阅读理解每日一练（7） 在线思维导图免费制作，点击“编辑”按钮，可对 2017年6月大学英语四级考试阅读理解每日一练（7） 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：a4135ab2876d13a1af22b662c7e374cd
思维导图大纲
2017年6月大学英语四级考试阅读理解每日一练（7）思维导图模板大纲
距离2017年6月大学英语四级考试还有一个半月的时间，已经报名的同学备考一定要抓紧，不要临时抱佛脚。新东方网英语四级频道为大家整理了英语四级阅读理解每日一练，每天一道题考试不担心。
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
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