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1、雅思阅读、强化标准教程搭配题：P21-23Youareadvisedtospendabout15minutesonQuestions1-12whicharebasedonReadingpassage1.OfDucksandDuckEggsForpeoplewholiketokeeppoultry,duckoffercertainadvantagesoverhens.Ducksareimmunetosomecommondiseasesfoundinhensandarelessvulnerabletoothers.Somebreedsof
2、duckproducebiggereggsthanhens.Inaddition,duckslayeggsoveralongerseasonthandohens.Poultrykeeperswithgardenshavelesstoworryaboutiftheykeepducksratherthanhensbecausetheformerarelessapttodigupplantsanddestroyroots.Whilebothhensandducksbenefitthegardenbyeatingpests,hensarekn
3、owntodamageherbandgrassbeds.Ducks,ontheotherhand,willsearchforinsectsandsnailsmorecarefully.Onlyverydelicateplantsareatriskfromthebroad,webbedfeetofducks.Likeallwaterbirds,ducksneedaccesstowater,andduckkeeperstypicallyprovidethisbybuildingapond.Somethingthislargeisnotab
4、solutelynecessary,however;ducksneedonlytobeabletodiptheirheadsinthewatertokeeptheirnostrilsclean.Ifapondisprovided,though,itisimportanttokeepducklingsawayfromituntiltheyareoldenoughtowithstandthecooltemperatureofthewaterabouteightweeks.Whenkeepingducks,onehastoconsiderj
5、usthowmuchthelandwillsupport.generallytheruleis100ducksperhalfhectare.Ifmorethanthisproportionisintroduced,thereisariskofcompactingthesoil,whichcanleadtomuddyconditionsforlongperiodsastherainisnoteasilyabsorbedintotheground.Whileducksoffermanyadvantagesoverhens,theymust
6、begivengreaterquantityoffood,especiallyifregulareggsaredesired.anadultduckwilleatbetween170to200gramsoffoodaday.iftheduckshaveaccesstograssandapond,theywillbeabletofindforthemselvesapproximately70%oftheirdailydietary,requirementsinwarmermonthsbutlessthanhalfthatincolder
7、times.Thereforeitisimportantthattheybefedenoughfood,suchasgrain,everyday.Experiencedduckkeepersraiseducklingseverythreeyearsorsobecauseitisafterthisperiodoftimethatducks,egg-layingpowersbegintoseriouslyweaken.Iftheaimistohatchducklings,keepersshouldbeawarethatnotallduck
8、smakegoodmothers,andthatcertainbreedsofduckappeartobeworsethanothers.Thepoormothersabandontheireggsafewdaysaft
