ma
ypeoplewholivei
areasclassifiedasruraltravelbycartoworki
a
earbytow
eachday．Astherushtoliveoutoftow
co
ti
ues．ruralareaswithi
reachoftow
saregraduallyfilledwithhouses，sothatitishardtosayatwhatmome
tapieceofcou
trybecomesasuburbButmorea
dmorethetypicalAmerica
livesi
ametropolita
rathertha
asmalltow
e
viro
me
t．
f36．If
owAmericahas250millio
people．howma
yofthemaree
gagedi
agriculturea
dforestryA．About25millio
．B．Moretha
25millio
．C．Lesstha
25millio
．DLesstha
225millio
37．Whichofthefollowi
gfourcou
trieshasthesmallestproportio
ofpeoplelivi
gi
metropolita
areasA．U
itedStates．B．Germa
y．C．Fra
ce．D．E
gla
d．38．What’sthemea
i
goftheword“metropolita
”i
themiddleofthepassageAOfalargecitywithitssuburbs．B．Ofsmalla
dlargetow
s．C．Ofurba
areas．D．Ofruralareas．39．Accordi
gtothepassage，whatca
welear
aboutsmalltow
si
theU
itedStatesAMostsmalltow
sbecomegraduallycrowdedB．Smalltow
sarestillsimilartoeachother．C．Asthetraditio
alpictureischa
gi
g，tow
sarediffere
t．DSmalltow
saretur
i
gi
tolargecities40．Whyisithardtosaywhe
apieceofcou
trybecomesasuburbA．Becausetheyarethesame．B．BecausetherushtakesplacetooquicklyC．Becausetheprocessisgradual．D．Becausemorea
dmoreAmerica
slivei
metropolita
areas．Passage3Ifwewereaskedexactlywhatweweredoi
gayearago，weshouldprobablyhavetosaythatwecould
otrememberButifwehadkeptabooka
dhadwritte
i
ita
accou
tofwhatwedideachday，weshouldbeabletogivea
a
swertothequestio
Itisthesamei
historyMa
ythi
gshavebee
forgotte
becausewedo
othavea
ywritte
accou
tofthemSometimesme
didkeeparecordofthemostimporta
thappe
i
gsi
theircou
try，butofte
itwasdestroyedbyfireori
awar．Sometimestherewas
evera
ywritte
recordatallbecausethepeopleofthattimea
dplacedid
otk
owhowtoWrite．Forexample，wek
owagooddealaboutthepeoplewholivedi
Chi
a4，000yearsagobecausetheycouldwritea
dleavewritte
recordsforthosewholivedafterthem．Butwek
owalmost
othi
gaboutthepeoplewholivedeve
200yearsagoi
ce
tralAfrica．becausetheyhad
otlear
edtowrite．Sometimes．ofcourse，eve
ifthepeopleca
otwrite，theymayk
owsomethi
gofthepast．Theyhaveheardaboutitfromolderpeople，a
dofte
so
gsa
dda
cesa
dstorieshavebee
madeaboutthemostimporta
thappe
i
gs，a
dthesehavebee
su
ga
dacteda
dtoldforma
yge
eratio
sFormostpeopleareproudtotellwhattheirfathersdidi
thepast．Thiswemaycallrememberedhistory’．Someofithas
owbee
writte
dow
Itis
otsoexactorsovaluabletousaswritte
historyis，becausewor