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Separately,the researchers trained 18 dogs torecognize that a bowl in one location of a room30.What does Parr-Cortes mainly want toalways contained food,while a bowl in another阅读part of the room did not.Then,they introducednew bowls in the middle spots to see how the dogs阅读stress in the last paragraph?A.The limitations of the new study.B.The need to train dogs to be less sensitive.would respond.After sniffing cloths from anxious humans,theThe importance of positive interactions解dogs were slower to approach new bowls placed解with dogs.close to the known position of the empty bowl,D.The difference in dogs'responses tosuggesting they were less likely to believe theydifferent human scents.contained a treat.The relaxed human scent didn'tseem to have any effect on the animals'behavior.gYet,stress has also been shown to reducehunger."It might not be that it's changing their31.What could be the best title for the text?阅decision-making but more that it's changing their阅A.Human Emotions Can Affect Dogs'motivation for food,"says Katherine Houpt,aAppetiteprofessor of behavioral medicine at CornellB.Sniffer Dogs:Detecting More Than Just理University."It makes sense because when you're理Scentssuper stressed,you're not quite as interested inHuman Stress Smell Causes Dogs'that candy bar."Pessimistic DecisionsStill,the research shows dogs are highlyD.Training Dogs to Make Careful Decisions:sensitive to even strangers'emotions.A New ApproachD"Importantly,it highlights how sensitivedogs are at picking up on mood,"says Parr-Precision agriculture(精准农业)has helped阅change the way farmers produce a crop,aimingCortes."So,keeping your relationship withyour dog based on happy,fun engagement isto deliver benefits in productivity andthe best way to have a happy dog."理effectiveness.Yet,convincing some farmers to trynew technologies is a challenge Tyler Strahl faces.解He is a precision agricultural specialist with afamily-owned seed(种子)company,.MustangSeeds."When it comes to precision agriculture,there are so many new products,"says Strahl."These products take time to test on the farm to see28.How did the researchers make the humanif they can bring value by saving time,increasingparticipants feel stressed?A.By showing them scary movies.阅yields,or providing a solution for a farmer."Graduating with a degree in precision读理By having them perform challenging tasks.agriculture and agricultural systems technology,C.By asking them to take anxiety理Strahl chose this path because he enjoys being outin the field,testing the technologies alongside aquestionnaires.D.By measuring their heart rates andproducer to see what is worth doing.At Mustangcortisol levelsSeeds,Strahl provides technology support,troubleshooting technology many farmers areemploying,and using the data collected to createand study seeds.As producers continue to be pushed to increase29.What does Katherine try to do?yield from fewer inputs,accurate targeting of the阅Offer an alternative explanation.right inputs at the right time will be decisive."SomeB.Suggest further research directions.阅fields have variability(变化性)that can be seen fromC.Express concern for the dogs in thethe road;other fields may look the same when westudy.理are driving by.However,when collecting data inyield maps or soils,they may show areas that can be解D.Support the findings with additionalevidence.managed differently.Applying variable-rateproducts allows farmers to reduce input costs in thelower-performing parts of a field and increaseproducts in places that can produce higher yieldsand return on investment(投资)，"Strahl says..6