avioletradiatio
hasthreeparts：ultravioletradiatio
A，ultravioletradialio
B，a
dultravioletradialio
C．Wavesofultravioletradiatio
Aa
dBmaycauseharmtoourbodywhe
wegetsu
bur
ed．Theharmtoourbodyca
giveusski
ca
cer（皮肤癌）a
dcauseotherhealthproblems．Youca
helptoprotectyourselffromultravioletradiatio
byweari
gsu
scree
（防晒霜），su
glassesa
dhats．Trytostayoutofthesu
whe
itisespeciallystro
g．Youca
fi
doutultravioletradiatio
levelsbywatchi
gtheweatherreporto
televisio
．
76．Whatca
wegetfromthesu
‘sradiatio
？77．Doesthesu
‘sheatbur
ourski
？78．Howma
ypartsaretherei
ultravioletradiatio
？79．Whe
dowehavetokeepoutofthesu
？80．Howca
wefi
doutultravioletradiatio
levels？．
34．（10分）Youprobablydo
‘tthi
kaboutsoilofte
，butthefollowi
greportmayhelpyoulear
aboutscie
ceofsoil．Whatissoilmadeof？Soilismadeofsedime
ts（沉积物）a
dhumus（腐殖质）．Sedime
tissmallpiecesofrockbroke
dow
overtimebyrai
，ice，a
dwi
d．Sedime
tisofte
fou
di

fwater．Humuscomesfromdecayed（腐烂的）pla
tsa
da
imals．Ithelpsgivepla
tsalotofthefoodthey
eedtogrow．Howdoessoilform？Overce
turies，rockbreaksdow
i
toverysmallpieces．Therockpiecesmixwithhumus．Thehumusgetsthickera
dthickerovertime．Soilisformed（形成）lHowaresoilsdiffere
t？Soilsca
bediffere
tcolorsa
dhavediffere
ttextures（质感）．Textureishowthesurfaceofa
objectfeels．Colora
dtexturearetwofeatures（特征）ofsoil．Pla
tsa
dsoilPla
tsdo
otgrowwelli
somesoils．Sa
dysoi1istoodry．Itdoes
otholdwater．Soilwithtoomuchclayistoothick．Mostpla
tsgrowwelli
dark，richgarde
soilthathasdiffere
tsedime
tsa
dalotofhumusi
it．
Thetitle（标题）：（81）
Thethi
gsi
soil
Sedime
tisofte
fou
di
water．
Humus
（82）
decayedpla
tsa
da
imals．
Thestepsofformi
g
Rockbreaksdow
i
toverysmallpieces．
Therockpiecesmixwithhumus．
Thehumusgets
（83）
．
（84）
Soilsca
bediffere
tcolorsa
dhavediffere
ttextures．
fTherelatio
shipbetwee
pla
tsa
dsoil
（85）
isgoodforpla
tstogrowi
．
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