ki
gover
Atprese
ttheworldhasabout6800la
guagesThedistributio
ofthesela
guagesishugely
u
eve
Thege
eralruleisthatmildzo
eshaverelativelyfewla
guagesofte
spoke
byma
y
peoplewhilehotwetzo
eshavelotsofte
spoke
bysmall
umbersEuropehaso
lyarou
d
200la
guagestheAmericasabout1000Africa2400a
dAsiaa
dthePacificperhaps3200of
whichPapuaNewGui
eaalo
eaccou
tsforwellover800Themedia
umber中位数of
speakersisamere6000whichmea
sthathalftheworldsla
guagesarespoke
byfewerpeople
tha
that
Alreadywellover400ofthetotalof6800la
guagesarcclosetoexti
ctio
消亡，witho
ly
afewelderlyspeakersleftPickatra
domBusuui
Cameroo
eightremai
i
gspeakers
Chiapa
ecoi
Mexico150Lipa
Apachei
heU
itedStatestwoorthreeorWadjigui

Australiao
ewithaquestio
mark
o
eoftheseseemstohave
uichcha
ceofsurvival
28Whatca
wei
feraboutla
guagesi
hu
tergatherertimes
ATheydevelopedveryfastBTheywerelargei
umber
CTheyhadsimilarpatter
sDTheywerecloselyco
ected
29Whichofthefollowi
gbestexplai
s“domi
a
t”u
derli
edi
paragraph2
AComplexBAdva
cedCPowerfulDModem
30Howma
yla
guagesarcspoke
bylesstha
6000peopleaprese
t
AAbout6800BAbout3400CAbout2400DAbout1200
31Whatisthemai
ideaofthetext
ANewla
guageswillbecreated
BPeopleslifestylesarcreflectedi
la
guages
CHuma
developme
tresultsi
fewerla
guages
DGeographydetermi
esla
guageevolutio

D
Wemaythi
kwereaculturethatgetsridofourwor
tech
ologyatthefirstsightof
somethi
gshi
ya
d
ewbuta
ewstudyshowsthatwekeepusi
gourolddevices装置well
aftertheygooutofstyleThatsbad
ewsforthee
viro
me
ta
dourwalletsasthese
outdateddevicesco
sumemuchmoree
ergytha
the
ewero
esthatdothesamethi
gs
Tofigureouthowmuchpowerthesedevicesareusi
gCallieBabbitta
dhercolleaguesat
theRochesterI
stituteofTech
ologyi
NewYorktrackedthee
viro
me
talcostsforeach
productthroughoutitslife一fromwhe
itsmi
eralsaremi
edtowhe
westopusi
gthedevice
Thismethodprovidedareadoutforhowhomee
ergyusehasevolvedsi
cetheearly1990s
fDevicesweregroupedbyge
eratio
Desktopcomputersbasicmobilepho
esa
dboxsetTVsdefi
ed1992Digitalcamerasarrivedo
thesce
ei
1997A
dMP3playerssmartpho
esa
dLCDTVse
teredhomesi
2002beforetabletsa
dereadersshowedupi
2007Asweaccumulatedmoredeviceshoweverwedid
tthrowoutouroldo
es“Thelivi
groomtelevisio
isreplaceda
dgetspla
tedi
thekids’rooma
dsudde
lyo
edayyouhaveaTVi
everyroomofthehouse”saido
eresearcherTheaverage
umberofelectro
icdevicesrosefromfourperhouseholdi
1992to1r