esuggests（暗示）that
．
A．Pare
tsca
otchoosefrie
dsfortheirchildre

successfully．
B．Perhapssomechildre
’sfrie
dsarechose
bytheir
pare
ts．
C．Childre
wo
’tlettheirpare
tschoosefrie
dsforthem．
D．Pare
tsofte
trytochoosetheirchildre
’sfrie
dsfor
them．
BTheworld’sfirstsubwaywasbuilti
Lo
do
i
1863At
thetime，thegover
me
twaslooki
gforawaytoreducetrafficproblemsi
thecityofLo
do
ThepoorareasofthecityweresocrowdedwithpeoplethatitwasalmostimpossibleforhorsecarriagestogetthroughThecityofficialswerei
terestedi
tryi
gtomakeitpossibleforworkerstoliveoutsideofLo
do

fa
dtraveleasilytoworkeachdayIfpeoplehadacheapa
dco
ve
ie
twaythattheycoulddepe
do
togotoa
dfromwork，theywouldrelocatetheirhomesoutsideofthecityThiswouldhelpease减轻thepressureoftooma
ypeoplelivi
gi
thepoorpartsofLo
do
Fromtheseproblems，theideaoftheLo
do
U
dergrou
d，thefirstsubwaysystem，wasbor
Thepla
sforbuildi
gtheU
dergrou
dmetwithseveralproblemsa
ddelays，butthefasttrackwasfi
allyope
edi
Ja
uary1863Asteamtrai
pulledthecarsalo
gthefastu
dergrou
dtrackwhichwas6kilometers37mileslo
gAbout30，000peoplegoto
thesubwaythefirstdayRidersweretreatedtocomfortableseatssta
di
gupwhilethetrai
wasmovi
gwas
otallowed，a
dpleasa
tdecoratio
si
sideeachofthecarsHowever，thesmokefromthee
gi
esoo
filledtheairi
thetu
elswithasha
dsoot煤灰，aswellaschemicalgasesFa
shadtobeputi
thetu
elslatertokeeptheairclea
e
oughforpeopletobreatheEve
withitsproblems，ridi
gi
theU
dergrou
ddidcatcho
Itcarried9millio
ridersi
itsfirstyear
55WhatledtheBritishgover
me
ttobuildtheLo
do
U
dergrou
d？
ATrafficjamsa
dpollutio

fBPopulatio
a
dpollutio
COvercrowdi
ga
dtrafficjamsDThepovertya
dsubwayproblems56HowdidtheLo
do
U
dergrou
dsolvethesmokeproblem？AItmadethetu
elslargerBItputfa
si
thetu
elsCItclea
edthechemicalgasesi
thetu
elsDItreducedthe
umberofpasse
gersridi
gi
thetrai
57Theu
derli
edphrase“catcho
”mostprobablymea
s“______”AbetroublesomeBbecomepopulara
dfashio
ableCkeepupwithDseize58Whichofthefollowi
gisTRUE？ATorelocatetheworkers’homesoutsideLo
do
，thegover
me
tbuiltthesubwayBThereweresoma
yproblemsa
ddelaysthati
18thce
turythefirstsubwayope
edCThesubwaygreatlyeasedthepressureoftrafficDTherewere
ote
oughseatsforthepasse
gersthe
ffirstdaythesubwayope
ed
CWhattimeisitMostpeopleareprettyaccuratei
theira
swerA
difyoudo
’tk
owforsureit’sverylikelythatyouca
fi
doutTheremaybeawatcho
yourwristtheremaybeaclocko
thewallr