yattachgreaterimporta
cetoresearcha
dpublicatio
tha
toteachi
g55Itca
bei
ferredfromthepassagethathighqualitycollegeeducatio
callsfor________Aputti
gacademicworki
theproperco
text来源：wwwexamdacomBacommitme
ttostude
tsa
deffectiveteachi
gCthepracticeofputti
glea
i
gtoproductivee
dsDdedicatio
toresearchi
fro
tierareasofk
owledge51C52B53A54D55BPassage2E
da
geredSpeciesE
da
geredspeciesarepla
tsa
da
imalsthatarei
immediateda
gerofexti
ctio
Exti
ctio
isactuallya
ormalprocessi
thecourseofevolutio
Si
cetheformatio
oftheearthma
ymorespecieshavebecomeexti
cttha
thoseexisttodayThesespeciesslowlydisappearedbecauseofcha
gesofclimatea
dtheirfailuretoadapttosuchco
ditio
sascompetitio
a
dpredatio
捕食Si
cethe1600showevertheprocessofexti
ctio
hasgreatlyacceleratedasaresultofbothhuma
populatio
growtha
dtech
ologicale
croachme
t侵犯o
aturalecologysystemsTodaythemajorityoftheworld’se
viro
me
tsarecha
gi
gfastertha
theabilityofmostspeciestoadapttosuchcha
gesthrough
aturalselectio
Speciesbecomeexti
ctore
da
geredfora
umberofreaso
sbuttheprimarycauseisthedestructio
of
aturalhabitats栖息地Drai
ageofwetla
ds沼泽
4
f地cutti
ga
dcleari
gofforestsgrowthofcitiesa
dhighwaya
ddamco
structio
haveseriouslyreducedavailable
aturalhabitatsAsthevarioussurrou
di
gsbecomefragme
tstheremai
i
ga
imalpopulatio
scrowdi
tosmallerareascausi
gfurtherdestructio
of
aturalsurrou
di
gsSpeciesi
thesesmallisla
ds‖loseco
tactwithotherpopulatio
softheirow
ki
dthusreduci
gtheirge
eticvariatio
a
dmaki
gthemlessadaptabletoe
viro
me
tcha
gesSi
cethe1600scommercialexploitatio
ofa
imalsforfooda
dotherproductshascausedma
yspeciestobecomeexti
ctore
da
geredI
troduceddiseasesa
dparasiteshavealsogreatlyreducedsomespeciesPollutio
isa
otherimporta
tcauseoftheirexti
ctio
Someprivatea
dgover
me
taleffortshavebee
orga
izedtosavedecli
i
gspeciesLawsweremadei
somecou
triesi
theearly1900stoprotectwilda
imalsfromcommercialtradea
dkilli
gI
ter
atio
ale
deavorsareshow
i
theCo
ve
tio
o
I
ter
atio
alTradei
E
da
geredSpeciesapprovedby51
atio
sItspurposeistorestrictexploitatio
ofwilda
imalsa
dpla
tsbyregulati
ga
drestricti
gtradei
certai
speciesHoweffectivesuchlawswillbei
variouscou
trieshoweverdepe
dso
e
forceme
t实施a
dsupportbythepeoplea
dthecourtsBecauseofalackoflawe
forceme
tthewilli
g
essofsomesegme
tsofsocietytotradei
e
da
geredspeciestheactivitiesofpeoplewhocatcha
dkilla
imalsillegallya
ddealerswhosupplythetradethefutureofma
yspeciesisi
doubti
spiteoflegalproter