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D.He finds being a dad quite challenging.BIf you look up in the sky,you probably see,at some point,an aircraft.And behind that aircraft are white,fluffystreaks ()And that's what we call a contrail.Contrails are made up of ice crystals that form when aircraftengines emit exhaust (that hits the cold air.The ice crystals reflect incoming light from the sun back into space,which has a cooling effect on theatmosphere.But the contrails also stop heat coming up from the ground from escaping into space.It is reflectedback down toward the ground.And so that's a warming effect.Stettler,an engineer from Imperial College London,says,on balance,contrails warm the atmosphere more than they cool it.And that's mainly because the coolingeffect due to reflecting of sunlight can only happen during the day,when the sun's shining,whereas the warmingeffect due to trapping of outgoing heat happens all of the time.How long do contrails last?This depends on the atmospheric conditions at the altitude where a plane is flying.Some contrails can form clouds that last for up to 18 hours.During that time,they spread out,trapping even moreheat.This process allows contrails to warm the planet about as much as the carbon dioxide emissions from aircraft.But when Stettler and his team analyzed flight data they obtained of Japan airspace,they found that mostcontrail warming was caused by just 2 percent of flights.And most of those flights originated in the late afternoonbecause as the sun goes down,cooling can no longer offset the warming.And the warming effect continuesto exist throughout the evening into the night.But what if the contrails that contribute the most to warming could begot rid of?24.What does "it"in paragraph 2 refer to?A.A cooling effect.B.Heat from the groundC.Light from the sun.D.Exhaust hitting the cold air.25.What can be learned about contrails?A.They can easily disappear in the air.B.They actually contribute to global warming.C.Their cooling effect happens all of the time.D.Their warming effect is usually overlooked.26.What is most likely to be talked about next?A.A future plan for Japan airspace.B.The negative influence of contrails.C.Other potential causes of contrails.D.A possible way to remove contrails.CWhen Mexican scientist of the evolution of animal behavior,Laura Cuaya,moved to Hungary for herpostdoctoral studies in Budapest,she brought her pet dog,Kun-kun,along for the ride.Cuaya couldn't help noticinghow locals warmed to dogs.This prompted her naturally curious scientific mind to start asking questions."Herepeople are talking all the time to Kun-kun,but I always wonder if Kun-kun can recognize that people in Budapestspeak Hungarian,not Spanish?"So she set out to find an answer through a scientific study.Cuaya and her colleagues decided to use brain images from MRI scanning to shed light on her hunch ()
