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1、閱讀理解第一部分 (一) Therateofpopulationgrowthisfastestinunderdevelopedcountries.Inthesecountriesahighbirthrateisaccompaniedbyalowereddeathratethankstoimprovedstandardsofpublichealth.Ideallyitshouldbepossibletocounterbalancetheeffectofareduceddeathratebyanincreaseduseoffamilyplanning.Inpra
2、ctice,however,populationcontrolisacomplexmatter.Throughouthistorypeoplehavedeterminedthesizeoftheirfamiliesaccordingtotheculturalvaluesoftheirsocieties. Populationcontrolhaslongbeenasubjectofdiscussionamongresearchers.Somehavearguedthatthesupplyofgoodlandislimited.Inordertofeedalarg
3、epopulation,badlandmustbecultivatedandthegoodlandoverworked.Asaresult,eachpersonproduceslessinagivenamountoftimeandthismeansaloweraverageincomethancouldbeobtainedwithasmallerpopulation.Otherresearchershavearguedthatalargepopulationgivesmorescopeforthedevelopmentoffacilitiessuchasspor
4、ts,roadsandrailways,whicharenotlikelytobebuiltunlessthereisabigdemandtojustifythem.Similarly,itcanbearguedthatthepubliccostsofsocietywillnotbesoheavytoeachindividualiftheyaresharedamongthemembersofalargepopulation. Oneofthedifficultiesinimplementingbirthcontrolliesinthefactthattheof
5、ficialattitudestopopulationgrowthvaryfromcountrytocountry.Inunderdevelopedcountrieswherealargepopulationispressingharduponthelimitsoffood,spaceandnaturalresources,itwillbethefirstconcernofgovernmenttoplacealimitonthebirthrate.Inawelldevelopedsocietytheproblemmaybemorecomplex.Adeclin
6、ingbirthratemayleadtounemploymentbecauseitresultsinashrinkingmarket.Citieswithadecliningpopulationmayhavetofacetheprospectofashrinkingtaxbaseandafallinlandvalues.Iftherearefewerchildrengoingtoschool,teachersmaybethrownoutofwork.Whenthepressureofpopulationonhousingdeclines,pricesalsod
7、eclineandthebuildingindustryisweakened.Facedwithconsiderationssuchasthese,thegovernmentofadevelopedcountrymaywellprefertoseeaslowlyincreasingpopulation,ratherthanonewhichisstableorindecline. 人口增長速度最快的是在欠發(fā)達國家。在這些高出生率降低死亡率由1由于公眾健康水平提高伴隨著國家。理想情況下應該可以對付由計劃生育增加使用平衡降低死亡率的效果。然而在實踐中,人口控制是一個
8、復雜的問題??v觀歷史的人