题目内容：
Accordingtotheauthor,whetherthelinguisticandculturaldiversityoftheworldcanbemaintainedinthefutureisstillamysterybecause___________.
A．globalisationmakesitpossibleforpeopletolivewithoutsmalllanguages B．manymigrantsstarttospeakmajorlanguagestoreplacetheirmothertongue
C．majorlanguagesaregaininggreatpopularityamongpeopleallovertheworld
D．languageswithsmallnumbersofspeakersareuselessincommerceandcommunication
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答案解析：