英语四级阅读理解训练集(40篇)!
c.itsindustrialcompetitiveness
d.itscontributionstoworldpeace
3.Theauthorindicatesthat______isthreateningAmericanpoliticalpower.
a.othercountries
b.thedecliningU.S.industrialbase
c.anewstandardformeasuringpower
d.lessadvancedtechnology
4.Americasucceededinshapingworldeventsoverpast40yearsprobablybecauseof___________.
a.itsabilitytoadapttechnology
b.itsabilitytotakeadvantageofthecapabilitiesofitspeople
c.itsabilitytocompeteintheworldmarkets
d.bothaandb
5.Thepurposeofwritingthisarticleis__________.
a.todrawthereaders'attentiontoanewstandardformeasuringpower
b.todemonstrateAmericanpoliticalinfluenceintheworld
c.toemphasizethateffortsmustbemadetostrengthenthedecliningU.S.industrialbase
d.toshowAmericanindustrialprowess
15/200答案：dabdc
大学英语四级阅读理解试题40篇之十六（含答案）
16/200
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
