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B.Make up basic Chinese dialogues.C.Learn characters through fun stories.D.Prepare for advanced vocabulary tests.23.What can we learn about the program?A.It involves skills for camping trips.B.It offers a discount if you book earlier.C.It has a fixed timetable regardless of time zones.D.It includes off-line interactive activities in China.BIn southeastern Brazil,local fishers walk into dark waters in search of mullet (Ontheir own,it would be tricky to find the silvery fish.But the humans get help from an unusualpartner:wild bottlenose dolphins.With nets in hand,the fishers patiently wait as their cetacean partners drive thefish toward the shore.A signal from the dolphins-usually a deep dive-indicates when theyshould cast their nets.This fishing partnership has passed down through the generations,lasting for more than a century.While researchers knew humans profited from this pairing,they couldn't confirm whetherit benefited the dolphins.Now,in a new study in Proceedings of the National Academy ofSciences,researchers suggest cetaceans that hunt with humans have more chances to live thanthose that don't."Human-wildlife cooperation in general is a rare phenomenon at a global scale."saysMauricio Cantor,a biologist at Oregon State University and leader of the study."Usuallyhumans gain the benefit,and nature pays the cost.But this interaction has been happening forover 1.50 years.”Fishers were more successful when they worked with the dolphins.When dolphins werepresent,the fishers were 17 times more likely to catch prey (and netted nearly four timesmore mullet when they timed their casting with the cetaceans'signals.Eighty-six percent ofall4.955 mullet caught during the study period came from“synchronous(同时的)interactions"-when the allies organized their actions perfectly with one another.The study also revealed dolphins hunting with humans had a 13 percent increase insurvival rate over other dolphins.These cooperative dolphins are more likely to stay near theshore,reducing their chance of entanglement (in illegal fishing equipment.Besides,thedolphins can take some fish directly from the fishers'harvest.24.What do the first two paragraphs talk about concerning Brazilian fishers?A.They trick dolphins into fishing for them.B.They harvest more fish with dolphins'help.C.They have been training dolphins over a century.D.They cast the fishing nets when dolphins surface.
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