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But for plants exposed to playbacks of bee sound5 kilohertz)and similarlylow-frequency sounds(.05 to 1 kilohertz),the final analysis revealed an unmistakableresponse.Within three minutes of exposure to these recordings,neetar sugar concentrationin the plants increased by 20 percent.A sweeter treat for pollinators(传粉者)，their theory goes,may draw in more insects,potentially increasing the chances of successful cross-pollination.Indeed,in fieldobservations,researchers found that pollinators were more than nine times more commonaround plants another pollinator had visited within the previous six minutes."We were quite surprised when we found out that it actually worked,"said Hadany."But after repeating it in other situations,in different seasons,and with plants grown bothindoors and outdoors,we feel very confident in the result."28.Why did Hadany's team expose plants to sound treatments?00了A.To see if they would respond to sound.B.To develop their ability to receive sound.C.To help them benefit from different soundsD.To detect the difference between plants and animals.29.Which of the following can bring a sweeter treat for pollinators?A.Flowers like primroses.B.Sounds like those of bees.C.Visits from other pollinators.D.Exposure to different sounds.80.What can be concluded from the study?A.Plants can identify different sounds.B.Sound attracts more pollinators to flowers.C.Plants produce nectar when pollinators come.D.Sound plays an important role in insects'survival.231.How did Hadany feel about their discovery deseribed in paragraph5 at first?B.It was unexpected.A.It was doubtful.D.It was satisfactory.C.It was acceptable.DMosofwhat its li to savor()a slice of chocolate cake or glass of ourmprtant experiencemomenor even visually exciting events,such as a splendid sunset.favorite wine.But savoring is a concept that goes far beyond that.We can also savornareceny published pper,researcher Maggie Pitts explores how people savor英语试题第？页（共12页）
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