定1个最佳选项。
BlackHoles
1Blackholesca
bebestdescribedasasortofvacuum，sucki
gupeverythi
gi
spaceScie
tistshavediscoveredthatblackholescomefroma
explosio
ofhugestarsStarsthatare
eardeathca
olo
gerbur
duetolossoffuel，a
d
f新东方在线职称英语频道httpzhiche
gkoolear
com分享
becauseitstemperatureca
olo
gerco
trolthegravitatio
al重力的force，hydroge
e
dsupputti
gpressureo
tothestar’ssurfaceu
tilitsudde
lyexplodesthe
collapses
2Blackholescomefromstarsthataremadeofhydroge
，othergasesa
dafewmetalsWhe
theseexplodeitca
tur
i
toastellarmass恒星质量blackhole，whichca
o
lyoccurifthestarislargee
oughshouldbebiggertha
thesu
fortheexplosio
tobreakiti
topieces，a
dthegravitystartstocompacteverypiecei
totheti
iestparticleTrytoseea
dcompare：ifastarthat’ste
timesthesizeofthesu
e
dsupbei
gablackholethat’s
olo
gertha
70kilometers，the
theEarthwouldbecomeblackholethat’so
lyafractio
ofa
i
ch
3Objectsthatgetsuckedi
ablackholewillalwaysremai
there，
evertobreakfreeButrememberthatblackholesca
o
lygobbleup吞噬objectswithi
aspecificdista
cetoitIt’spossibleforalargestar
earthesu
tobecomeablackhole，butthesu
willco
ti
uetostayi
placeOrbits轨道do
otcha
gebecausethe
ewlyformedblackholeco
tai
sexactlythesameamou
tofmassaswhe
itwasastar，o
lythisitsmassistotallyco
tractedthatitca
e
dupas
obiggertha
astate
4Sofar，astro
omershavefiguredoutthatblackholesexistbecauseofAlbertEi
stei
’stheoryofrelativityI
thee
d，through
umerousstudies，theyhavediscoveredthatblackholestrulyexistSi
ceblackholestraplighta
ddo
otgive
f新东方在线职称英语频道httpzhiche
gkoolear
com分享
offlight，itis
otpossibletodetectblackholesviaatelescopeButastro
omersco
ti
uetoexploregalaxies银河系，spacea
dthesolarsystemtou
dersta
dhowblackholesItispossiblethatblackholesca
existformillio
sofyears，a
dlaterco
tributefurtherprocessi
galaxies，whichca
eve
tuallyleadtocreatio
of
ewe
titiesScie
tistsalsocreditblackholesashelpfuli
lear
i
ghowgalaxiesbega
toform
AWhathappe
stotheobjectsarou
dablackhole
BIsthereproofthatblackholesreallyexist
CHowwereblackholes
amed
DWhatarediffere
ttypesofblackholes
EWhatareblackholesmadeof
FHowareblackholesformed
23Paragraph1F
24Paragraph2E
25Paragraph3A
26Paragraph4B
27Blackholesareformedafter___D______
f新东方在线职称英语频道httpzhiche
gkoolear
com分享
28Whe
alargestarexplodesthegravitycompactseverypiecei
to____F_____
29A
ewlyformedblackholea
dthestaritcomesfromarr