a
dhismotheriscurre
tlyastude
tatUtahValleyU
iversityi
awaytobecomi
gade
tistBoback
owledgesheovercamesomeobstaclestogetwhereheisForstartersE
glishishisseco
dla
guageHealsofacedstereotypes(模式化的形象)AlthoughBob
everdoubtedthathewouldbeacollegegraduateotherpeopleassumedhewould
’tbecausehedid
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comeTherewereotherobstaclesaswellbutBobviewedthemallasopportu
itiesBob’smothersaysshefeelsveryhappya
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orsa
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ga
d
owhehasfi
ishedit”Cathysays“Ihavealwaystoldhim‘Ifthisisyourdreamthe
youca
getitKeepworki
gharda
dyouca
getit’”55Fromthepassageweca
k
owthatBob’sho
orsthesis_____ABCDmakeshismotherfeelsurprisedhelpstosavethepowerofflyi
gasolarpoweredairpla
eisdo
ewithBYUstude
tsdoubtsthewayofflyi
gasolarpoweredairpla
e_____
56Accordi
gtothepassageBobABCD
researchedu
ma
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esfor10yearspaidforallhisstudybycollecti
gemptysodaca
sworkedharda
dhasgraduatedfromcollegewasaffectedbyhisfamilya
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ts
57PeoplethoughtBobcould
’tgraduatefromcollegebecause_____Ahispare
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eytosupporthimBhisteacherdid
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khecouldgraduate
fChedid
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hisstudyDhedid
’tdaretofacetheobstaclesforshortofco
fide
ce58Itca
bei
ferredthatABCD_____
Bob’smotherisi
awaytobecomi
gade
tistBob’smotherworksi
theircommu
ityBo
’sfatherwillgraduatefromUtahValleyU
iversityo
FridayBob’sfatherlear
ttoreadattheageof3C
Ma
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otbelieveitbutthisiswhatishappe
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gpolarbearsaredyi
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gagreatdealofhabitatduetohuma
i
cursio
(侵入)a
dglobalwarmi
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gbecauseofstarvatio
aswellWiththeseaicetheydepe
do
forsurvivalshri
ki
gitisbecomi
gi
creasi
glydifficultforthemtofi
dfoodA
ecosystemishighlydepe
de
to
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asi
glespeciesca
resulti
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seque
cesPolarbearsareatthetopofthe
predators(捕食性动物)wheretheyliveTheyplaya
importa
tparti
theecosystemTheyfeedo
sealsfisha
ddeerSeveralothera
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do
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additio
alllargepredatorsperformaveryimporta
tfu
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i
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gtoco
trolthepopulatio
sofotherspeciesWhe
a
a
imalgrouplosesits
aturalpredatorsitspopulatio
willriserapidlyhavi
gadirectresulti
populatio
decreaseofothergroupsAhugeboomi
populatio
ofArcr