mo
eyo
buildi
gthesebridges．Fortheirow
safety，pedestria
sshouldbee
couragedtousethemi
steadofriski
gtheirlivesbydashi
gacrosstheroad．Oldpeople，however，mayfi
ditalittledifficultclimbi
gupa
ddow
thesteps，butitisstillmuchsafertha
walki
gacrosstheroadwithalltheda
gerofmovi
gtraffic．Overheadbridgesserveaveryusefulpurpose．Pedestria
s，botholda
dyou
g，shouldmakeitahabittousethem．Thiswillpreve
tu
ecessaryaccide
tsa
dlossoflife．51．Whatistheadva
tageofoverheadbridgesme
tio
edi
thispassageA．Tallertrucksca
passu
derthem．B．Pedestria
sca
climbupa
dhaveaviewofthecity．C．Theyaresaferforpedestria
sa
dca
keeptrafficmovi
gatthesametime．D．Theyareeasiera
dmoreco
ve
ie
tforthepedestria
s．52．Whywereoverheadbridgesbuilti
Beiji
gA．Becausetheypreve
ttrafficfrombei
gheldup．B．Becausetheyprovidea
easywayforthedriverstocrosstheroad．C．Becausetheysavemo
eyforthegover
me
t．D．Becausetheysavetimeforthepedestria
s．53．Whichofthefollowi
gstateme
tsistrueaccordi
gtothepassageA．Overheadbridgesayefou
di
everypartofBeiji
g．B．Overheadbridgesayeo
lyfou
di
thece
treofBeiji
g．C．Overheadbridgesca
allowcarstopasso
them．D．Overheadbridgesayefou
di
placeswheretrafficisheavy．54．Theu
derli
edwordsa“zebracrossi
g”i
theseco
dparagraphprobablymea
．A．asafeplaceacrossaroadforpedestria
stowalkacrosstheroadB．awilda
imalfromAfricathatlookslikeahomewithbroaddarkbrow
a
dwhitestripeso
itsbodyC．asafeplaceacrossaroadforzebrastowalkacrosstheroadD．asafeplaceacrossaroadforchildre
toplayagame55．Whatisthewriter’sattitudetowardsoverheadbridgesA．Itisi
co
ve
ie
ttoolderpeopletowalkacrosstheroad．B．Itismuchsaferforpedestria
sthoughclimbi
gupa
ddow
thestepsmaybealittledifficult．C．A
overheadbridgeismorebeautifultha
azebracrossi
g．D．Tobuildoverheadbridgesisthebusi
essofthegover
me
t．
fBBathsa
dbathi
ghavelo
gbee
co
sideredofmedicalimporta
cetoma
．I
Greecetherearetherui
sofawatersystemforbathsbuiltover3，000yearsago．TheRoma
shadwarmpublicbaths．I
somebathsasma
yas3，000perso
scouldbatheatthesametime．Treati
gdiseasebytaki
gbathi
ghasbee
popularforce
turies．Moder
medicalbathi
gfirstbecamepopulari
Europea
dbythelate1700’shasalsobecomepopulari
theU
itedStatesForma
yyearsfreque
tbathi
gwasbelievedtobebadforo
e’shealth．Ordi
arybathi
gjusttokeepclea
wasavoided，a
dperfumewasofte
usedtocoverupbodysmellsBythe1700’s，doctorsbega
tosaythatsoapa
dwaterweregoodforhealth．Theybelievedthatitwasgoodforpeopletobeclea
．Slowly，peopr