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use specific noises to identify other elephants.A few animals,including parrots and dolphins,have been known to use sounds thatare similar to names.Each dolphin invents a signature whistle that is unique to it,andother members of its species communicate with it by imitating()this special call.Thenew study,led by Michael Pardo of Colorado State University,shows that wild Africanelephants use names in a way that is not just copying sounds and is much closer to the wayhumans use names.For the study,the researchers recorded 625 sounds made by wild African elephants inKenya that they called“rumbles(隆隆声)”.This is the most common type of call producedby elephants,and it can travel long distances-as far as 3.7 miles.It takes place at a verylow frequency,which means humans can't hear it.The researchers analyzed the sounds using computers and found that certain rumbleswere directed at specific elephants to get their attention.They found that all the elephantsin the herd used the identical call to get a particular elephant's attention-these calls werenot just nicknames used by one of the elephant's friends.Also,unlike the way dolphinscommunicate,the rumbles were not imitations of the elephant they were trying to communicatewith.The researchers then played back some of the recorded rumbles to the elephants.Theyfound that elephants responded more to their own name than to other calls,coming towardit more quickly or calling back faster.Caitlin O'Connell-Rodwell,an elephant expert,said,"The study shows that elephants can still keep in touch with one another even across alarge area."She told Live Science,"It allows them to spread out much further and stillhave very close tabs(密切关注)on individuals.”28.How can elephants recognize others according to the new study?A.By employing certain sounds.B.By using a signature whistle.C.By giving out specific smells.D.By adopting particular postures.29.What can be inferred about Michael Pardo's research?A.Its findings were not accepted by the public.B.It asked researchers to analyze elephants'lives.C.Its researchers needed to engage in outdoor work.D.It revealed elephants'sounds are at a high frequency.30.Why do elephants use the same call?A.To get noticed by the herd.B.To imitate other elephants.C.To lead the way for other elephants.D.To draw a specific elephant's attention.英语试题第6页共12页