阅读下列四篇短文，从每小题后所给的A,B,C或D四个选项中，选出最佳选项。FormillionsofFacebookusers,choosingwhichphototouseforanonlineprofileisanimportantdecision.AccordingtoastudybyresearchersattheUTDallasCenter,thephotosweselectmayreflectindividualpreferences,buttheyalsoappeartoreflectmoredeeplyrooted,unconsciousculturaldifferences.Previousresearchhasshownthatculturecanaffectnotonlylanguageandcustom,butalsohowweexperiencetheworldandprocessinformation.Westerncultures，forexample，conditionpeopletothinkofthemselvesashighlyindependententities(实体)，whereasEastAsianculturesstresscollectivismandinterdependence.Dr.DenisePark,co-directoroftheCenteratUTDallas,andformergraduatestudentDr.ChihMaoHuangoftheUniversityofIllinois,werecuriousaboutwhetherthesepatternsofculturalinfluenceextendtocyberspace.InapaperpublishedintheInternationalJournalofPsychology,theyexaminedtheprofilephotographsofmorethan500activeFacebookusersfromtheUnitedStatesandEastAsia.Overall,theyfoundthatprofilephotosofAmericansaremorelikelytofocusontheindividual'sface，whiletheprofilesofEastAsianstendtolessemphasizethefaceandincludemorebackgroundfeatures.AmericansalsoshowgreatersmileintensitycomparedtoEastAsianFacebookusers.ThefindingsshowmarkedculturaldifferencesinthefocusofattentionamongEastAsianandAmericanFacebookusers.Moreover,theyechopreviousresearchonculturalinfluencesonvisualperception(感知），attention,andreasoningintheofflineworld.“WebelievethesefindingsrelatetoaculturalbiastobemoreindividualisticandindependentintheUSandmorecommunalandinterdependentinAsia”，saidPark.Theresearchalsofoundthatculturalinfluencesoverourself-presentationonlinecanshiftovertimeandfromplacetoplace.Inoneofthestudysamples,AmericansstudyinginJapanandJapanesestudyingintheUSbothshowedatendencytoadjusttheirprofilephotostothegeneralpreferencesoftheirhostcountry.“Facebookconstitutesanextendedsocialcontextinwhichpersonalprofilesmirrorvariousindividualcharacteristics，privatethoughts，andsocialbehaviors，”notedHuang.“Assuch，thestudypresentsanewapproachtoinvestigatecognitionandbeh