你说的是dolphin的那个文章吗？还是第四个？dolphin的第一题：原文：Professor:Wehavebeentalkingabouthowseaanimalsfindtheirwayunderwater,howtheynavigate,andthisbringsupaninterestingpuzzle,andoneI\'msureyou\'llallenjoy.Imean,everybodylovesdolphins,right?Anddolphins,well,theyactuallyproducetwotypesofsounds.Uh,onebeingthevocalizationsyouareprobablyallfamiliarwith,whichtheyemitthroughtheirblowholes.Buttheoneweareconcernedwithtodayistherapidclicksthattheyuseforecholocation,sotheycansensewhatisaroundthem.Thesesounds,ithasbeenfound,areproducedintheair-fillednasalsacsofthedolphin.Andthepuzzleishowdoestheclicksoundsgettransmittedintothewater?It\'snotaseasyasitmightseem....选项：APartsofthedolphinanatomythatallowittonavigateBTwodifferenttypesofcommunicationusedbydolphins这是听力最开始，这里提到了这节课的中心：aninterestingpuzzle，既是thepuzzleishowdoestheclicksoundsgettransmittedintothewater。首先，研究的对象是海豚navigate的方法，不是与其它海豚communicate的方法。其次，尽管教授提到了海豚有两种不同的发声办法，但是今天这节课的重点是第二种发声方法，即快速click造成的声音。而且在后来的讲课中你也发现，她解释的重点是海豚大脑的特殊构造如何工作，使得这种声音能够传输到水中。B是一个很有迷惑性的选项。至于第三题，不是多选题，所以我不知道你要问的是哪个文章了。（第三题的话答案原文中很明显：Well,turnsoutdolphinshaveastructureintheirforeheads,justinfrontoftheirnasalsacs,calledamelon.Now,themeloniskindofalargesac-likepouch,madeupoffattissue.Andthisfattissuehassomeratherfascinatingacousticalproperties...）追问dolphin后面那一篇...讲screendance的
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