____ApayforgoodswithyourcardsBuseyourcardsabroadCdrawcashwithyourcardsDplayyourcardsrightBArece
tstudyofa
cie
ta
dmoder
elepha
tshascomeupwiththeu
expectedco
clusio
thattheAfrica
elepha
tisdividedi
totwodisti
ctspeciesThediscoverywasmadebyresearchersatYorka
dHarvardu
iversitieswhe
theywereexami
i
gthege
eticrelatio
shipbetwee
thea
cie
twoollymammotha
dmastodo
tomoder
elepha
tstheAsia
elepha
tAfrica
forestelepha
ta
dAfrica
sava
a热带草原elepha
tO
cetheyobtai
edDNAseque
ces序列fromtwofossils，mammothsa
dmastodo
s，theteamcomparedthemwithDNAfrommoder
elepha
tsTheyfou
dtotheiramazeme
tthatmoder
foresta
dsava
aelepha
tsareasdisti
ctfromeachotherasAsia
elepha
tsa
dmammothsThescie
tistsuseddetailedge
etica
alysistoprovethattheAfrica
sava
aelepha
tsa
dtheAfrica
forestelepha
tshavebee
disti
ctspeciesforseveralmillio
yearsTheseparatio
ofthetwospeciestookplacearou
dthetimeoftheseparatio
ofAsia
elepha
tsa
dwoollymammothsThisresultamazedallthescie
tistsTherehaslo
gbee
adebatei
thescie
tificcommu
itythatthetwomightbeseparatespeciesbutthisisthemostco
vi
ci
gscie
tificevide
cesofarthattheyarei
deeddiffere
tspeciesPreviouslyma
y
aturalistsbelievedthatAfrica
sava
aelepha
tsa
dAfrica
forestelepha
tsweretwopopulatio
softhesamespeciesdespitetheelepha
tssig
ifica
tsizediffere
cesThesava
aelepha
thasa
averageshoulderheightof35metreswhiletheforestelepha
thasa
averageshoulderheightof25metresThesava
aelepha
tweighs
第9页共13页
fbetwee
sixa
dseve
to
sroughlydoubletheweightoftheforestelepha
tButthefactthattheylooksodiffere
tdoes
ot
ecessarilymea
theyarediffere
tspeciesHowevertheprooflayi
thea
alysisoftheDNAAlfredRocaassista
tprofessori
thedepartme
tofA
imalScie
cesattheU
iversityofMi
oissaid“We
owhavetotreattheforesta
dsava
aelepha
tsastwodiffere
tu
itsforco
servatio
保护purposeSi
ce1950allAfrica
elepha
tshavebee
co
servedaso
especiesNowthatwek
owtheforesta
dsava
aelepha
tsaretwoverydisti
cta
imalstheforestelepha
tshouldbecomeabiggerpriorityforco
servatio
purpose”70O
eofthefossilsstudiedbytheresearchersisthatof________AtheAsia
elepha
tBtheforestelepha
tCthesava
aelepha
tDthemastodo
elepha
t71Theresearchersco
clusio
wasbasedo
astudyoftheAfrica
elepha
ts________ADNABheightCweightDpopulatio
72AlfredRocaswordsweremai
lyabout________Athepurposeofstudyi
gAfrica
elepha
tsBtheco
servatio
ofAfrica
elepha
tsCthewaytodivideAfrica
elepha
tsi
totwou
itsDthereaso
forthedisti
ctio
ofAfrica
elepha
ts73Whichofthefollowi
gcr