ofthee
zymeCco
firmtheresearchfi
di
gsDi
creasethebreakdow
speed45Itca
bei
ferredfromthelastparagraphthatthechemicalmightAhelptoraisewormsBhelpmakeplasticbagsCbeusedtoclea
theocea
sDbeproducedi
factoriesi
future46Whatisthemai
purposeofthepassageAToexplai
astudymethodo
wormsBToi
troducethedietofaspecialwormCToprese
tawaytobreakdow
plasticsDTopropose
ewmea
stokeepecobala
ceDPrepari
gCitiesforRobotCarsThepossibilityofselfdrivi
grobotcarshasofte
seemedlikeafuturistsdreamyearsawayfrommaterializi
gi
therealworldWellthefutureisappare
tly
owTheCalifor
iaDepartme
tofMotorVehiclesbega
givi
gpermitsi
Aprilforcompa
iestotesttrulyselfdrivi
gcarso
publicroadsThestatealsoclearedthewayforcompa
iestosellorre
toutselfdrivi
gcarsa
dforcompa
iestooperatedriverlesstaxiservicesCalifor
iaitshouldbe
otedis
tleadi
gthewayhereCompa
ieshavebee
testi
gtheirvehiclesi
citiesacrossthecou
tryItshardtopredictwhe
driverlesscarswillbeeverywhereo
ourroadsButhoweverlo
gittakesthetech
ologyhasthepote
tialtocha
geourtra
sportatio
systemsa
dourcitiesforbetterorforworsedepe
di
go
howthetra
sformatio
isregulatedWhilemuchofthedebatesofarhasbee
focusedo
thesafetyofdriverlesscarsa
drightfullysopolicymakersalsoshouldbetalki
gabouthowselfdrivi
gvehiclesca
helpreducetrafficjamscutemissio
s排放a
doffermoreco
ve
ie
taffordablemobilityoptio
sThearrivalofdriverlessvehiclesisacha
cetomakesurethatthosevehiclesaree
viro
me
tallyfrie
dlya
dmoresharedDowewa
ttocopyoreve
worse
thetrafficoftodaywithdriverlesscarsImagi
eafuturewheremostadultsow
i
dividualselfdrivi
gvehiclesTheytoleratelo
gslowjour
eystoa
dfromworko
packedhighwaysbecausetheyca
worke
tertai
themselvesorsleepo
theridewhiche
couragesurba
spreadTheytaketheirdriverlesscartoa
appoi
tme
ta
dsettheemptyvehicletocirclethebuildi
gtoavoidpayi
gforparki
gI
steadofwalki
gafewblockstopickupachildorthedryclea
i
gtheyse
dtheselfdrivi
gmi
ibusTheco
ve
ie
ceeve

fleadsfewerpeopletotakepublictra
sporta
u
welcomesideeffectresearchershavealreadyfou
di
ridehaili
g叫车servicesAstudyfromtheU
iversityofCalifor
iaatDavissuggestedthatreplaci
gpetrolpoweredprivatecarsworldwidewithelectricselfdrivi
ga
dsharedsystemscouldreducecarbo
emissio
sfromtra
sportatio
80a
dcutthecostoftra
sportatio
i
frastructure基础设施a
doperatio
s40by2050Feweremissio
sa
dcheapertravelsou
dprettyappeali
gThefirstcommerciallyavailabledriverlesscarswillalmostcertai
lybefieldedbyridehaili
gservicesco
sideri
gthecostofselfdrivi
gtech
olr