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fishes for almost two decades,the discovery of the stingray,which was released alive backinto the river,filled him with hope."It proves these underwater big fish,which are in criticaldanger,still exist,"says Hogan.Hogan's pursuit for big fish,called the Megafishes Project and supported by National Geographic Society,began in 2005 when fishermen in northern Thailand pulled a 646-pound cat-fish (out of the Mekong River.The species is known that it was the largest,that is,the heaviest-ever caught in the area.Arriving at the island,the team found Thun's fish,a female that appeared to be in goodhealth.It was more than 13 feet from nose to tail.The researchers were shocked to see herweight at 661 pounds.She set a new world record.The original aim of the Megafishes Projectwas to find,study,and protect the world's largest freshwater fishes.The project focused onspecies that could grow to at least the size of a human and that lived only in freshwater.Hogan initially drew up a list of roughly 30 species to focus on.The challenge,as Hogan soon learned,was that many of these fish are hard to find.They live in remote,inaccessible places,and often in deep waters.Early on in the search,there were relatively few scientists studying them.What was clear was that the river giants were shrinking in number,threatened by a hostof factors including overfishing,water pollution,and the presence of dams,which block mi-grating fish from completing their life cycles.As Hogan's work progressed,its focus increas-ingly turned to conservation."It was never about just finding the biggest fish,"Hogan says,"but looking for ways to protect these extraordinary animals that,in some cases,have beenon Earth for hundreds of millions of years but are now drifting out of entities.28.Why was Zeb Hogan full of hope?A.Freshwater fishes weren't in danger.B.Many large fishes existed in rivers.C.The stingray was put into the river.D.Some large fishes didn't die out.29.What can we know about the 646-pound catfish?A.It was also caught by Moul Thun.B.It was caught in the Mekong River.C.It was injured very seriously.D.It's the largest recorded freshwater fish.30.Which of the following is the original goal of the Megafishes Project?A.Protecting big freshwater fishes.B.Studying fishes smaller than humansC.Finding about 30 species of big fishes.D.Setting new record in finding fishes.31.What does the underlined part "drifting out of entities"in the last paragraph mean?A.Being protected.B.Getting ill.C.Dying out.D.Living well.0To find out how effective language learning applications allow mobile users to study a【高二英语第5页（共10页）】·23-201B·