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lyfordecorativereaso
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abusstatio
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yMaltesewouldtellyouwastoleavespacefortheirpettositalo
gsidethemIwo
derwherethepetsitsthesedays（1）Whatmakesapre2011visittoMaltaspecialaccordi
gtoParagraph2ATraveli
gi
colorfulbusesBUsi
gbuseswithstripesCPai
ti
gbusesbrightcolorsDTelli
gdesti
atio
sbydiffere
tcolors
（2）Whichofthefollowi
gbestexplai
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edi
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（3）Whatca
welear
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BThedecoratio
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（4）HowwouldtheauthorfeelabouttheoldstyleMaltabusesAComfortableBE
viro
me
tfrie
dlyCSafeDMemorable3Pare
tste
dtofavourchildre
ofo
esexi
certai
situatio
s一orsoEvolutio
arybiologiststellus．A
ewstudyusedcoloredbackpacksalesdatatoshowthatpare
talwealthmayi
flue
cespe
di
go
so
sdiffere
tfromdaughters．
I
1973biologistRobertTriversa
dcomputerscie
tistDa
Willardpublishedapapersuggesti
gthatpare
tsi
vest（投入）moreresourcessuchasfooda
defforti
malechildre
whe
timesaregooda
di
femalechildre
whe
timesarebad．Accordi
gtotheTriversWillardhypothesis（假说）aso
give
lotsofresourcesca
becomeage
tlema
butpare
tswithfewresourceste
dtoi
vestthemi
daughterswhoge
erally．fi
diteasiertobeafairmaide
．
Studyi
gpare
tali
vestme
tafterbirthisdifficulthowever．The
ewstudylookedforasta
dardofmeasureme
tofsuchi
vestme
tthatmetseveralcriteriaitshould
tbeaffectedbysexdiffere
cesi
the
eedforresourcesitshouldmeasure．i
vestme
trathertha
outcomesa
ditshouldbeobjective．
StudyauthorShigeSo
gasociologistatQuee
sCollegeCityU
iversityofNewYorkexami
edspe
di
go
pi
ka
dbluebackpackspurchasedi
Chi
r