题目内容：
回答(50)题 A．Somepeoplemightwanttolearnsomeofthesesongsbyhearts.
B．InNewGuineathereisanextremelyrichsourceofdifferentlanguage,butmorethan100ofthemareindangerofextinction(灭绝).
C．However,hewasafrequentvisitortotheCatawbareservationinSouthCarolinawherehelearnedthelanguage.
D．Theselanguagesdon'thavemanynativespeakers.
E．Fortherestofus,whenalanguagedies,welosethepossibilityofauniquewayofseeinganddescribingtheworld.
F．Astheselanguagesbecomemorepowerful,theiruseastoolsofbusinessandculture
increases.
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答案解析：