o
shouldbetreatedwithcautio
becausesoma
ypeoplewholivei
areasclassifiedasruraltravelbycartoworki
a
earbytow
eachda．y．Astherushtoliveoutoftow
co
ti
ue．s．ruralareaswithi
reachoftow
saregraduallyfilledwithhouses，sothatitishardtosayatwhatmome
tapieceofcou
trybecomesasuburbButmorea
dmorethetypicalAmerica
livesi
ametropolita
rathertha
asmalltow
e
viro
me
．．t
36．If
owAmericahas250millio
peop．le．howma
yofthemaree
gagedi
agriculturea
dforestryA．About25millio．
．B．Moretha
25millio．
．C．Lesstha
25millio．
．DLesstha
225millio
37．Whichofthefollowi
gfourcou
trieshasthesmallestproportio
ofpeoplelivi
gi
metropolita
areas
A．U
itedState．s．B．Germa
．y．C．Fra
c．e．D．E
gla
．d．38．Whatsthemea
i
goftheword“metropolita
”i
themiddleofthepassage
AOfalargecitywithitssuburb．s．B．Ofsmalla
dlargetow
．s．C．Ofurba
area．s．D．Ofruralarea．s．39．Accordi
gtothepassage，whatca
welear
aboutsmalltow
si
theU
itedStatesAMostsmalltow
sbecomegraduallycrowdedB．Smalltow
sarestillsimilartoeachothe．．r
C．Asthetraditio
alpictureischa
gi
g，tow
sarediffere
．．tDSmalltow
saretur
i
gi
tolargecities40．Whyisithardtosaywhe
apieceofcou
trybecomesasuburb
A．Becausetheyarethesam．e．B．BecausetherushtakesplacetooquicklyC．Becausetheprocessisgradua．．lD．Becausemorea
dmoreAmerica
slivei
metropolita
area．s．
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
awa．．rSometimestherewas
evera
ywritte
recordatallbecausethepeopleofthattimea
dplacedid
otk
owhowtoWri．te．Forexample，wek
owagooddealaboutthepeoplewholivedi
Chi
a4，000yearsagobecausetheycouldwritea
dleavewritte
recordsforthosewholivedafterthe．m．Butwek
owalmost
othi
gaboutthepeoplewholivedeve
200yearsagoi
ce
tralAfric．a．becausetheyhad
otlear
edtowri．te．
Sometime．s．ofcourse，eve
ifthepeopleca
otwrite，theymayk
owsomethi
gofthepas．．tTheyhaveheardaboutitfromolderpeople，a
dofte
so
gsa
dda
cesa
dstorieshave
fbee
madeaboutthemostimporta
thappe
i
gs，a
dthesehavebee
su
ga
dacteda
d
toldforma
yge
eratio
sFormostpeopleareproudtotellwhattheirfathersdidi
thepas．．tThiswemaycallrememberedhistory．Somr