be
efitsof
ge
eediti
ghavealreadybee
testedi
livi
gpatie
ts．
I
2015，afivemo
tholdgirlfromtheUKwassavedafterdoctorsusededitedcellstofightoffher
ca
cer．Asoftoday，she’salivea
dwell．
A
di
theUSlastyear，scie
tistsma
agedtoremoveHIVcellsfromseveralpatie
tsbyediti
gthe
ge
esi
sidetheirbodies．
Somepeoplehopethati
thefuture，diseasesorbirthdetectscouldsimplybe“editedout”．However，
fothersbelievethiscouldleadtosocalleddesig
erbabies，givi
gpare
tstheoptio
tochooseeverythi
g
fromeyecolortoi
tellige
ce．
“Youcouldfi
dwealthypare
tsbuyi
gthelates‘tupgrades’fortheirchildre
，leadi
gtoeve
greater
i
equalitytha
wealreadylivewith，”MarcyDar
ovsky，directoroftheSa
Fra
ciscoCe
terforGe
etics，
toldBBCNews．
I
spiteoftheseethicalco
cer
s，expertssayit’s
otpossibletocreatethe“perfect”huma

bei
g．Despitetheprogressscie
tistshavemade，Wedo
’tu
dersta
dhuma
ge
ese
oughtogiveall
u
bor
childgreatbrai
poweroramazi
gsi
gi
gabilities．
“Right
ow，wek
ow
othi
gaboutge
etice
ha
ceme
t，”Ha
kGreely，adirectorofscie
cesat
Sta
fordU
iversity，US，toldTheNewYorkTimes．“We’re
evergoi
gtobeabletosay，ho
estly，
‘Thisembryolookslikeitwouldscorehigho
thetwopartSAT．’”
Soitlookslikeifwewa
tgoodexamresults，ortoimpresspeoplewithourpia
oskills，we’11have
tostickwiththeoldfashio
edmethodofplai
hardworkatleastfor
ow．
12．Theu
derli
edword“alter”i
Paragraph1probablymea
s________．
A．record
B．cha
ge
C．remove
D．i
crease
13．Whydosomepeopleco
siderhuma
ge
eediti
gastepbackwards
A．Theydo
’tthi
kitisa
effectivewaytolightdiseases．
B．Theyareco
cer
edthatitcouldleadtoge
eticmutatio
s．
C．Theythi
kitcouldleadtodesig
erbabiesa
di
creasedi
equality．
D．Theyworrythatitcouldmakepare
tsaba
do
childre
withbirthdefects．
14．Whatwasthefirstsuccessfulexampleofhuma
embryoge
eediti
g
A．Age
eticmutatio
relatedtoheartdiseasewasremovedbyscie
tists
B．A
ewbor
babywithca
cerwassavedbyeditedcells．
C．HIVcellswereremovedfrompatie
ts’bodies．
D．Somebirthdefectsweresimplyeditedout．
15．Whatca
weco
cludefromthetext
A．Ge
eediti
gisregardedastheperfectwaytotreatbirthdefects．
B．Thereisstillalo
gwaytogotofullyu
dersta
dhuma
ge
es．
fC．Ge
eediti
gcouldhelpe
ha
cehuma
i
tellige
cei
the
earfuture．D．Scie
tistsarepessimisticaboutthefutureofge
eediti
g．第二节共5小题；每小题25分，满分125分
阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。选项中有两项为多余选项。I
themiddleofthePacificOcea
liestheti
yisla
d
atio
r