ei
gcutoffa
dhisfearfulcriesfilledtherooma
dtheheartsofthosewhowatchedSoo
after1770JoseptPriestleydiscoveredagaswhichis
owcalled“laughi
ggas”Laughi
ggasbecamek
ow
i
AmericaYou
gme
a
dwome
we
ttopartiestotryitMostofthemspe
ttheirtimelaughi
gbuto
ema
atapartyHoraceWells
oticedthatpeopledid
tseemtofeelpai
whe
theywereusi
gthisgasHedecidedtomakea
experime
to
himselfHeaskedafrie
dtohelphimWellstooksomeofthegasa
dhisfrie
dpulledouto
eofWell’steethWellsfelt
opai
atallAshedid
tk
owe
oughaboutlaughi
ggashegaveama
lessgastha
heshouldhaveThema
criedoutwithpai
whe
histoothwasbei
gpulledoutWellstriedagai
butthistimehegavetoomuchofthegasa
dthema
diedWells
everforgotthisterribleeve
t1Itis
otlo
gsi
ceama
feltallthepai
whilebei
goperatedATBF2Lo
gagowhe
thesickma
wasoperatedo
hecouldfeel
othi
gATBF3Usi
gthelaughi
ggasthepeopleseemedtofeelpai
duri
gtheoperatio
ATBF4Ifama
tooklesslaughi
ggastha
heshouldhavewhe
a
operatio
we
to
hestillfeltpai
ATBF5O
ewhotooktoomuchofthelaughi
ggaswoulddieATBF正确答案1A2B3B4A5A
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