EDoesyourolderbrotherthinkhe’sclevererthanyou?Wellhe’sprobablyright．AccordingtoanewresearchpublishedinthejournalIntelligencetheoldestchildreninfamiliesarelikelytohavethehighestIQsandtheyo
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Doesyourolderbrotherthinkhe’sclevererthanyou?Wellhe’sprobablyright．AccordingtoanewresearchpublishedinthejournalIntelligencetheoldestchildreninfamiliesarelikelytohavethehighestIQsandtheyoungestthelowest
AnumberofstudieshavesuggestedthatIQscoresdeclinewithbirthorder．InthemostrecentstudyatVrijeUniversityAmsterdamresearcherslookedatmenandwomenwhoseIQhadbeentestedattheagesof5，12，and18．
Theresultswhichshowatrendfortheoldesttoscorebetterthantheyoungestineachtestinvolvedabout200000people．Thatshowedthatfirst-bornshadathree-pointIQadvantageoverthesecond-bornwhowasapointaheadofthenextinline．
Theorderofbirthcanalsoaffectpersonalityachievementandcareerwithfirst-bornsbeingmoreacademicallysuccessfulandmorelikelytowinNobelprizes．Howevereldsetchildrenarelesslikelytoberadicalandpioneering．CharlesDarwinforexamplewasthefifthchildofsix．
Exactlywhythereshouldbesuchdifferencesisnotclearandthereareanumberoftheoriesonenvironmentalinfluencesonthechild．
Theso-calleddilution(稀释法)theorysuggeststhatasfamilyresourcesbothemotionalandphysicalaswellaseconomicarelimiteditfollowsthatasaresultasmorechildrencomealongthelevelsofparentalattentionandencouragementwilldrop．Anothertheoryisthattheintellectual(智力)environmentinthefamilyfavorsthefirst-bornwhohasatleastforsometimethebenefitofindividualcareandhelp．
Thetheorywhichenjoysthemostsupportisthattheextratimeandpatiencethattheearlier-bornsgetfromtheirparentscomparedwiththosearrivinglatergivesthemanadvantage．
1．Whatisthepassagemainlyabout?
A．IQscoreshavelittletodowiththeorderofbirth．
B．Intellectualfamiliesfavorthefirst-born
C．TheorderofbirthcanhaveaneffectonIQ
D．Theorderofbirthcanaffectpersonalityachievementandcarrer．
2．ByusingCharlesDarwinasanexampletheauthorwantstoprovethat
A．eldestchildrenarethesmartestinafamily
B．youngestchildrenwillusuallybecomeexperts
C．first-bornsaremorelikelytowinNobelprizes
D