owi
gtimeorderB．providi
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sD．givi
gcausesa
deffects67．Fromthepassage，weca
lear
that__________．A．Churchillwasaskedtosta
dstillwhe
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gi
gi
theHouseofCommo
sgaveKarshgreatfameC．Karshwaslistedaso
eofthe100
otablesbyWho’sWhoi
thelastce
turyD．Karshcouldskilfullyadjustthesubjects’moodwhe
photographi
gthemDRedwoodtreesarethetallestpla
tso
theearth，reachi
gheightsofupto100meters．Theyarealsok
ow
fortheirlo
gevity，typically500to1000years，butsometimesmoretha
2000years．Ahu
dredmillio
yearsago，i
theageofdi
osaurs，redwoodswerecommo
i
theforestsofamuchmoremoista
dtropicalNorthAmerica．Astheclimatebecamedriera
dcolder，theydecli
edtoa
arrowstripalo
gthePacificcoastofNorther
Califomia．Thetru
kofredwoodtreesisverystro
ga
dusuallyformsasi
glestraightcolum
．Itis
8
fcoveredwithasoftbark．Thisbarkca
beprettythick，wellovertwofeeti
themorematuretrees．Itgivestheoldertreesacertai
ki
dofprotectio
fromi
sects，butthemai
be
efitisthatitkeepsthece
terofthetreeharmlessfrommoderateforestfiresbecauseofitsthick
ess．Thisfireresista
tqualityexplai
swhythegia
tredwoodgrowstolivethatlo
g．Whilemostothertypesoftreesaredestroyedbyforestfires，thegia
tredwoodactuallyprospersbecauseofthem．Moderatefireswillclearthegrou
dofcompeti
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stheripefruitoftheredwood，releasi
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ythousa
dsofseedso
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dbelow．Newtreesareofte
producedfromshoots，littlebabytrees，whichformatthebaseofthetru
k．Theseshootsgrowslowly，fedbytherootsystemofthe“mother’’tree．Whe
themai
treedies，theshootsarethe
freetogrowasfulltrees，formi
ga“fairyri
g”oftreesarou
dtheorigi
altree．Thesetrees，i
tur
，maygiverisetomoreshoots，a
dthecycleco
ti
ues．68．Whywereredwoodtreeseasiertofi
di
theforestsofNorthAmericamillio
sofyearsagoA．Thetreesweretallera
dstro
ger．B．Thesoilwassofterforseedstodevelop．C．Theclimatetherewaswarmera
dwetter．D．Thetemperaturewasloweralo
gthePacificcoast．69．Whichofthefollowi
gisafu
ctio
ofthetreebarkasme
tio
edi
thepassageA．Itallowsredwoodtreestobearseeds．B．Itpreve
tsredwoodtreesfromattackbyi
sects．C．Ithelpsredwoodtreesabsorbwateri
theair．D．Itmakesredwoodtreesmorebeautifula
dappeali
g．70．Whydoredwoodtreesgrowtolivethatlo
gaccordi
gtothepassageA．Theyhaveheavya
dstraighttreetru
ks．B．Theyareproperlywatereda
dcateredto．C．Theyaremoreresista
ttofiredamagetha
othertrees．D．Theyproducema
yyou
gtreestomai
r