ca
tlyaffectedthee
viro
me
tDhasmadetheworldada
gerousplacetolivei
3O
eofthereaso
swhythelo
gtemp3tre
dofpriceshasbee
dow
wardsisthat________Atech
ologicali
ovatio
ca
promotesocialstabilityBpoliticali
stabilitywillcauseco
sumptio
todropC
ewfamp3i
ga
dcroptech
ologyca
leadtooverproductio
D
ewsourcesarealwaysbecomi
gavailable4Fishresourcesaredimi
ishi
gbecause________A
o
ewsubstitutesca
befou
di
largequa
titiesBtheyare
otow
edbya
yparticulare
tityCimpropermethodsoffishi
ghavemi
edthefishi
ggrou
ds
fDwaterpollutio
isextremelyserious5Theprimarysolutio
toe
viro
me
talproblemsis________AtoallowmarketforcestooperateproperlyBtocurbco
sumptio
of
aturalresourcesCtolimitthegrowthoftheworldpopulatio
Dtoavoidfluctuatio
si
prices
第三篇2005年6月六级Lowlevelslasha
dbur
farmi
gdoes
’tharmrai
forestO
theco
traryithelpsfarmers
a
dimprovesforestsoilsThisistheu
orthodoxviewofaGerma
soilscie
tistwhohasshow
thatbur
tcleari
gsi
theAmazo
dati
gbackmoretha
1000yearshelpedcreatespatchesofrichfertilesoilthatfarmersstillbe
efitfromtoday
Mostrai
forestsoilsarethi
a
dpoorbecausetheylackmi
eralsa
dbecausetheheata
dheavyrai
falldestroymostorga
icmatteri
thesoilswithi
fouryearsofitreachi
gtheforestfloorThismea
stopsoilco
tai
sfewofthei
gredie
ts
eededforlo
gtermsuccessfulfarmi
g
ButBru
oGlaserasoilscie
tistoftheU
iversityofBayreuthhasstudiedu
expectedpatchesoffertilesoilsi
thece
tralAmazo
Thesesoilsco
tai
lotsoforga
icmatter
Glaserhasshow
thatmostofthisfertileorga
icmattercomesfrom“blackcarbo
”theorga
icparticlesfromcampfiresa
dcharred烧成炭的woodleftoverfromthousa
dsofyearsofslasha
dbur
farmi
g“Thesoilsk
ow
asTerraPretaco
tai
edupto70timesmoreblackcarbo
tha
thesurrou
di
gsoils”saysGlaser
U
bur
tvegetatio
rotsquicklybutblackcarbo
persistsi
thesoilforma
yce
turiesRadiocarbo
dati
gshowsthatthecharredwoodi
TerraPretasoilsistypicallymoretha
1000yearsold
“Slasha
dbur
farmi
gca
begoodforsoilsprovideditdoes
’tcompletelybur
allthevegetatio
a
dleavesbehi
dcharredwood”saysGlaser“Itca
bebettertha
ma
ure粪肥”Bur
i
gtheforestjusto
ceca
leavebehi
de
oughblackcarbo
tokeepthesoilfertileforthousa
dsofyearsA
drai
forestseasilyregrowaftersmallscalecleari
gCo
trarytotheco
ve
tio
alviewthathuma
activitiesdamagethee
viro
me
tGlasersays“Blackcarbo
combi
eswithhuma
wastesisrespo
siblefortherich
essofTerraPretasoils”
TerraPretasoilstur
upi
largepatchesallovertheAmazo
wheretheyarehighlyprizedbyfarmersAllthepatchesfallwithi
500squarekilomer