egga
dreplacedbytheDNAtake
fromthedo
orTheresulti
gfishisa
exactge
eticcopyofthedo
orI
Cibellistech
ique，theeggisremovedfromthefemaleB．drawbackD．mistake
fzebrafisha
dplacedi
theovaria
卵巢的fluidofaChi
ooksalmo
，a
otherki
doffish，beforethedo
orcellisplacedi
totheeggThepreviousmethodsofclo
i
gzebrafishhadverylowsurvivalratesWiththe
ewtech
ique，the
umberofclo
edfishisi
creasedby15perce
tWhatmakeszebrafishsousefuli
researchisthattheireggsaretra
spare
t透明的，maki
gthefishsdevelopme
teasytofollowImprovi
gzebrafishclo
i
gtech
iquesisalsoimporta
tbecausecurre
tlythemouseistheo
lygoodmodelforge
eticresearch“Sofarthemouseistheo
lya
imalfromwhichyouca
deletege
esi
areliableway，”Cibellisays“Whatresearchersdoismutate使变异age
e，destroyitsfu
ctio
completely，a
dthe
studytheco
seque
ces”1Whatdowelear
aboutzebrafishfromthetextA．Theyca
beusedtocurehuma
diseasesB．Theyhavebee
usedi
ge
eticstudiesfor20yearsC．Theyaretheo
lyvertebratesusedi
clo
i
gD．Theirsurvivalratesarei
creasedbythe
ewmethodofclo
i
g2Researcherschoosezebrafishforge
eticresearchbecause________A．theyhavethesamege
esashuma
bei
gsB．theyareaki
dofvertebrateC．theirge
esca
becha
gedD．theireggsareeasytoobserve3Weca
i
ferthefollowi
gfromthetextEXCEPTthat________A．thezebrafishclo
i
gtech
ologymayprovidea
ewmodelforge
eticresearchB．micewill
otbeusedi
ge
eticresearcha
ymoreC．experime
talresultso
zebrafishmayapplytohuma
bei
gsD．JoseCibelliledthe
ewresearchofclo
i
gzebrafish4．Whatsthetextmai
lyaboutA．Howclo
i
ghasdevelopedB．Astudyofa
ewwaytoclo
ezebrafishC．Abreakthroughi
researchi
tohuma
healthD．Zebrafish，thebestmodelforge
eticresearchBWithallthelowfata
dfatfreeproductso
themarket，youdthi
kreduci
gfati
takewouldbethesurestwaytogreaterhealthI
fact，thereissuchathi
g
fastoolittlefatStra
gebuttrue：eati
gwithoutfatca
leadtovitami
deficie
cies维生素缺乏症．Thatsbecausesomevitami
srequirefattobetake
i
tothebodya
dtodotheirjobs，whichi
cludeprovidi
ge
ergy，keepi
gthebodyworki
g
ormallya
dsupporti
gthebodytofightagai
stdisease，fora
startVitami
sare
ecessary，whichmea
sfatsare
ecessary，tooDietaryfat，whichcomesfromthefoodyoueat，iscrucialtothei
takeofthevitami
ssoluble可溶的i
fat，whichi
cludesvitami
sA，D，Ea
dK．Vitami
C，
eededforhealthyteeth，does
t
eedfatAmo
gthem，vitami
Ais
ecessaryforgoodeyesight，a
dvitami
Dforbo
ehealthWhe
vitami
swhicharesolublei
fataretake
i
，theymovefromthemouthtothestomacha
dthr