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1、智课网TOEFL备考资料托福TPO17综合写作精讲【动物类-鸟】摘要:有关动物类的文章也是我们托福考试过程中经常会遇到,托福TPO17综合写作部分的内容就设计到了这一块,下面我们就通过对托福TPO17综合写作内容的精讲,来为大家详细介绍一二,希望对大家会有一定的帮助。托福TPO17综合写作阅读材料:Inthepastcentury,thesteadygrowthofthehumanpopulationandthecorrespondingincreasinginagricultureandpesticideusehavecausedmuchharmtowildlif
2、eintheUnitedStates–birdsinparticular.Unfortunatelyforbirds,thesetrendsarelikelytocontinue,withtheresultthatthenumberofbirdsintheUnitedStateswillnecessarilydecline.在过去的一个世界,人类数量的增加以及随之而来的农业生产的发展和杀虫剂的增加使得很多美国的野生动物受到了影响,而这种问题在鸟类上表现得更为明显。更加不幸的是,由于人口数量、农业生产和杀虫剂使用的趋势不会改变,美国的鸟类数量将会必然地随之下降。Fir
3、st,ashumanpopulationsandsettlementscontinuetoexpand,birds’naturalhabitatswillcontinuetodisappear.Forests,wetlands,andgrasslandswillgivewaytoevermorehomes,malls,andoffices.Asthetraditionalareassuitableforbirdskeepdecreasing,sowillthesizeofthebirds’populationsthatdependonthosevanishingha
4、bitats.首先,随着人口数量和居住面积的不断扩张,鸟类天然的栖息地持续地减少。森林、湿地和草原都变成的住宅、商场和写字楼。随着那些传统的适宜鸟类栖息的地方持续减少,失去赖以生存栖息地的鸟类,数量自然是减少的。Second,agriculturalactivitiesmustincreasetokeeppacewiththegrowinghumanpopulation.Thegrowthofagriculturewillalsoresultinthefurtherdestructionofbirdhabitatsasmoreandmorewildernessare
5、asareconvertedtoagriculturaluse.Asaresult,birdpopulationsinruralareaswillcontinuetodecline.第二,为了能够满足增长的人口数量,农业活动也必须随之增加。农业的增加的代价是进一步破坏鸟类的栖息地,越来越多的荒地变成了农业用地。因而,鸟类在乡村的数量也随之持续减少。Third,ashumansettlementsexpandandagricultureincreases,theuseofchemicalpesticideswillalsoincrease.Pesticidesarep
6、oisonsdesignedtokillagriculturalandhomegardenpests,suchasinsects,butinevitable,pesticidesgetintothewaterandintothefoodchainforbirdswheretheycanharmbirds.Birdsthateatthepoisonedinsectsordrinkcontaminatedwatercandieasaresult,andevenifpesticidesdonotkillbirdsoutright,theycanpreventthemfro
7、mreproducingsuccessfully.So,pesticideshavesignificantlycontributedtodeclinesinbirdpopulation,andbecausetherewillcontinuetobeaneedtocontrolagriculturalpestsinthefuture,thisdeclinewillcontinue.第三,随着人类居住地的扩展和农业的发展,化学农药的使用也增加了。农药是用来杀死诸如昆虫之类的生长在农田或者菜园的害虫的有毒物质。不可避免的是,这些农药会进入水系和食物链,进而伤害鸟类。鸟