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31.What is probably the best title of this text?A.Flying Taxis Will Bring Convenience B.Flying Taxis Take Lead in TransportC.Flying Taxis Are Starting to Take OffD.Flying Taxis Might Solve Traffic JamsDsr bib wolHoney yields()in the U.S.have been declining since the 1990s,with honey producersand scientists unsure why,but a new study by Penn State researchers has uncovered clues in themystery of the missing honey.Using five decades of data from across the U.S.,the researchers analyzed the potentialfactors and mechanisms that might be affecting the number of flowers growing in differentregionsand,by extension,the amount of honey produced by honey bees.The study,recently published in the journal Environmental Research,found that changes inhoney yields over time were connected to herbicide()application and land use,such asfewer land conservation programs that support pollinators().Annual weather anomaliesalso contributed to changes in yields.Overall,researchers found that climate conditions and soil productivity-the ability of soilto support crops based on its physical,chemical and biological propertieswere some of themost important factors in estimating honey yields.States in both warm and cool regionsproduced higher honey yields when they had productive soils.The eco-regional soil and climate conditions set the baseline levels of honey production,while changes in land use,herbicide use and weather influenced how much is produced in a givenyear,the researchers summarized.0&biawiol isg won s ssood nsdw Hotuoy"What's really unique about this study is that we were able to take advantage of 50 years ofdata from across the continental U.S.,"said Gabriela Quinlan,the lead author on the study anda National Science Foundation(NSF)."This allowed us to really investigate the role of soil,eco-regional climate conditions,annual weather variation,land use and land managementpractices on the availability of nectar for honey bees and other pollinators.Herbicide application rates were also important in predicting honey yields,potentiallybecause removing flowering weeds can reduce nutritional sources available to bees."Our findings provide valuable insights that can be applied to improve models and designexperiments to enable beekeepers to predict honey yields,growers to understand pollinationservices,and land managers to support plant-pollinator communities and ecosystem services,"Quinlan said.25时的最夏者10正91&8o面【高考冲刺试卷（四）·英语第7页（共12页）】
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