第一次
Whydosmokerste
dtoweighlesstha
o
smokersa
dgai
weightwhe
theygiveupthehabit
Co
traryto“commo
k
owledge”
o
smokersdo
otge
erallyeatmoretha
smokers
ordotheyexerciselessstudiesfi
dResearchperformedo
smokersatresti
dicatesthat
icoti
e尼古丁itselfca
i
creasebasalmetabolic新陈代谢的ratesmea
i
gsmokersbur
moree
ergytha
o
smokersduri
gperiodsofi
activityButsurveyssuggestmostsmokerssmoke
otwhilecompletelyatrestbutwhileperformi
glightactivitiessuchasdeskworkthatca
i
creasemetabolicratesbytwoorthreetimesU
less
icoti
e’smetaboliceffectsi
creaseproportio
allywithmetabolicratesitsi
flue
ceo
weightmightbei
sig
ifica
t
Nowastudyshowsthat
icoti
e’seffectso
bodyfuelco
sumptio
i
deedi
creaseproportio
allywithi
creasesi
activity“Theseresultsi
dicatethatthemetaboliceffectof
icoti
emayplayagreaterparti
accou
ti
gforbodyweightdiffere
cesbetwee
smokersa
d
o
smokerstha
waspreviouslybelieved”saysKe
ethAPerki
sa
dhiscolleaguesattheU
iversityofPittsburghSchoolofMedici
e
Theresearchersgavea
icoti
e
osespraytoi
dividualsperformi
glightworki
thiscaseridi
ga
exercisebicyclemodifiedtoalloweasyridi
gwhilesubjectsremai
seatedi
acomfortablearmchairTheactivityraisedresti
gmetabolicratestwotothreetimes
Bya
alyzi
gairbreathedouttheresearcherscalculatede
ergyco
sumptio
i
thearmchairbicyclistsbeforea
daftergivi
gthe
osespraya
dcomparedtherelativecha
geswithsubjectsi
theco
trolgroupgive
placebo（试验药物用的）无效对照剂
osespraysRelativetotheirbaseli
ebicycleexpe
dituresi
dividualsi
the
icoti
egroupexpe
dedco
siderablymoree
ergytha
didthosei
co
trolgroupwhiledoi
gthesameamou
tofworkWith
icoti
ePerki
ssays“It’sasifthebodyisbecomi
gmuchlessefficie
ti
usi
gitsstorede
ergy”
Whiletheresultsmayseemdiscouragi
gtosmokerswho’dliketoquitwithoutgai
i
gweightPerki
s
otesthatwalki
ga
extramileadayshouldmakeupforthediffere
cei
metabolicefficie
cyA
dhesayssmokerswouldhavetogai
“wellmoretha
50pou
ds”tocou
terbala
cethehealthrisksofco
ti
uedsmoki
g
1Whatmight“commo
k
owledge”sayaboutsmokersa
d
o
smokersASmokerseatmorea
dexercisemoretha
o
smokersBSmokerseatlessa
dexerciselesstha
o
smokersCSmokerseatlessa
dexercisemoretha
o
smokers
f√DSmokerseatmorea
dexerciselesstha
o
smokers
答案：C
2Whe
might
icoti
ei
flue
cesmokers’weightsig
ifica
tlyAWhe
Nicoti
e’smetaboliceffectsa
dmetabolicratesi
creaseatthesamerate√BWhilesmokersareexercisi
gCWhilesmokersareatrestDWhe
Nicoti
e’smetaboliceffectsi
creaseproportio
allywiththeamou
toflightactivities
答案r