C
GUATEMALACITY(Reuters)–Afishthatlivesinmangroveswamps(红树沼泽)acrosstheAmericascanliveoutofwaterformonthsatatime,similartohowanimalsadapted(适应)tolandmillionsofyearsago,anewstudyshows.
TheMagroveRivulus,atypeofsmallkillifish,livesinsmallpoolsofwaterinacertaintypeofemptynutorevenoldbeercansinthemangroveswampsofBelize,theUnitedStatesandBrazil.Whentheirlivingplacedriesup,theyliveonthelandinlogs(圆木),saidScottTaylor,aresearcherattheBrevardEndangeredLandsPrograminFlorida.
Thefish,whosescientificnameisRivulusmarmoratus,cangrowaslargeasthreeinches.Theygrouptogetherinlogsandbreatheairthroughtheirskinuntiltheycanfindwateragain.
Thenewscientificdiscoverycameafteratr iptoBelize.
“Wekickedoveralogandthefishjustcamecrowdingout,”TaylortoldReutersinneighboringGuatgemalabytelephone.HesaidhewillmakehisstudyonthefishknowntothepublicinanAmericanmagazineearlynextyear.
Inlabtests,Taylorsaidhefoundthefishcanliveupto66daysoutofwaterwithouteating.
Someotherfishcanliveoutofwaterforashortperiodoftime.ThewalkingcatfishfoundinSoutheastAsiacanstayonlandforhoursattime,whilelungfishfoundinAustr alia,AfricaandSouthAmericacanliveoutofwater,butonlyinaninactivestate.ButnootherknownfishcanbeoutofwateraslongastheMangroveRivulusandremainactive,accordingtoPatr iciaWright,abiologistatCanada’sUniversityofGuelph.
Furtherstudiesofthefishmaytellhowanimalschangedovertime.
“Theseanimalsliveinconditionssimilartothosethatexistedmillionsofyearsago,whenanimalsbeganmakingthetr ansition(过渡)fromwaterontoland,”Wrightsaid.
49.TheMangroveRivulusisatypeoffishthat_______.
A.likeseatingnuts
B.preferslivingindryplaces
C.isthelongestlivingfishonearth
D.canstayalivefortwomonthsoutofwater
正确答案:D


