Adetailedstudyofbiologicaldiversity（多样性）intownandcitygardenshasfoundthattheyofferavitalrefugeforanimalsandplants.Ithasalsofundthatmanyoftheideasaboutwildlifegardeningarenot 1 .Infactsmallgardensarejustasgoodasbiggardensat 2 wildlifesuburbangardensarenotalwaysbetterthancitygardensandnon-nativeplantsarenotalwaysharmfultonativeinsectsandbirds.Britain’s16000000gardensarearefugeforhundredsofspeciesofanimalsandplantsthatwouldfindit3 tosurviveonintensively（精细地）farmedland.Accordingtothestudygardensareamazinglyvariedevencomparedto 4 environmentsthataregoodforwildlife.Smallgardensaremoreinteresting 5 theyvaryagreatdealinbotanicalenvironmentAllthewildliferespondstothevariation.

KenThompsonofSheffieldUniversitywasinvolvednthefirstdetailedstudyofthe 6 livinginBritishgardenswhenheandhiscolleaguessurveyed61gardensinSheffield.Theyreallyfounda（n） 7 diversityofplantsandanimals.Theyalsoidentifiedarangeofsimple 8 thatimprovedagarden’senvironmentforwildlife.Thetopthingistogrowmorebigtreesasthesegreatly 9 thevolumeofvegetationinthegardenandalotof 10 meansalotofplacestoliveandalotofthingstoeat. 11 createapondforinsectsandfrogs.Thinkbeforestockingitwithfishwhichwilleatinsecteggs.Alsoitisnotwisetolightupthegardenatnightwithbrightlawnlampswhichwill 12 manynightcreaturesFinallydon’tbetootidy:don’tbe 13 toclearupeverythingwhenthegardenstopsflowering.Just 14 abitofthingslyingaround.

Tosumuppeoplewhowanttoturntheirgardensintowildliferefugesshould 15 andletthegrassgrowtalltheflowersturntoseedandtreesexpandskyward.

1．A．true B．basic C．vivid D．simple

2．A．selecting B．importing C．offering D．attracting

3．A．impossible B．illegal C．lucky D．convenient

4．A．peaceful B．warm C．natural D．clean

5．A．before B．unless C．but