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ID:31511930
大小:53.00 KB
页数:12页
时间:2019-01-12
《大学英语四级阅读理解试题及答案解析(四)》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、范文范例精心整理大学英语四级阅读理解试题及答案(四)十六 Treesshouldonlybeprunedwhenthereisagoodandclearreasonfordoingsoand,fortunately,thenumberofsuchreasonsissmall.Pruninginvolvesthecuttingawayofobergrownandunwantedbranches,andtheinexperiencedgardenercanbeencouragedbythethoughtthatmoredamageresultsf
2、romdoingitunnecessarilythanfromleavingthetreetogrowinitsownway. First,pruningmaybedonetomakesurethattreeshaveadesiredshapeorsize.Theobjectmaybetogetatreeoftherightheight,andatthesametimetohelpthegrowthofsmallsidebrancheswhichwillthickenitsappearanceorgiveitaspecialshape.Sec
3、ondly,pruningmaybedonetomakethetreehealthier.Youmaycutdiseaedordeadwood,orbranchesthatarerubbingagainsteachotherandthuscausewounds.Thehealthofatreemaybeencouragedbyremovingbranchesthatareblockingupthecentreandsopreventingthefreemovementofair.word完美格式范文范例精心整理 Oneresultofprun
4、ingisthatanopenwoundisleftonthetreeandthisprovidesaneasyentryfordisease,butitisawoundthatwillheal.Oftenthereisaracebetweenthehealingandthedeseaseastowhetherthetreewillliveordie,sothatthereisaperiodwhenthetreeisatrisk.Itshouldbetheaimofeverygardenertoreducewhichhasbeenpruneds
5、moothandclean,forhealingwillbesloweddownbyroughness.Youshouldallowthecutsurfacetodryforafewhursandthenpaintitwithoneofthesubstancesavailablefromgardenshopsproducedespeciallyforthispurpose.Pruningisusuallywithoutinterferencefromtheleavesandalsoitisveryunlikelythatthecutsyumak
6、ewillbleed.Ifthisdoeshappen,itis,ofcourse,impossibletopaintthemproperly. 1.Pruningshouldbedoneto______. a.makethetreegrowtaller b.improvetheshapeofthetree c.getridofthesmallbranches d.makethesmallbranchesthicker 2.Treesbecomeunhealthyifthegardener______.word完美格式范文范例精心整
7、理 a.allowstoomanybranchestogrowinthemiddle b.doesnotprotectthemfromwind c.forcesthemtogrowtooquickly d.damagessomeofthesmallsidebranches 3.Whyisaspecialsubstancepaintedonthetree? a.Tomakeawoundsmooth b.Topreventdiseaseenteringawound c.Tocoveraroughsurface d.Tohelpaw
8、oundtodry 4.Agoodgardenerprunesatree______. a.atintervalsthroughouttheyea
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