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DTo tackle the problem of tiny plastics polluting waterways,chemists in the CzechRepublic are thinking small.Their brainchild is a new microrobot which is no biggerthan the tip of a sharpened pencil.When sunlight hits them,they produce chemicalreactions that push them through water in a specific direction.When they find a pieceof plastic,they stick to it and start to break it down.Chemist Martin Pumera at the Czech University led the project.A decade ago,he chose to focus on the problem posed by microplastics.They're everywhere-fromthe bottom of the ocean to air blowing onto ice atop mountains.They've turned up indrinking water.Some studies estimate that billions of pieces of plastic end up in theworld's waters.The plastic has many sources,from shopping bags to washing andcleaning wipes.In lab experiments,the star-shaped swimmers stuck onto each of four differenttypes of plastic.And after a week exposed to light,the robots had reduced theweight of the plastics.It wasn't much-only by percent.But that was an indicationthat they were breaking the plastic down.They also caused the surface of the plasticto change from smooth to rough.That's another sign that the robots were degrading(it.The new study is a proof of concept type.That means it shows somethingcan be done successfully.In fact,Pumera says they still have a long way to go.There are many types ofplastics.And even these microrobots are unlikely to succeed in degrading them all.The researchers also have not yet shown how safe this system is for the environment,although Pumera says that's their next goal.The first real-world test will be in awastewater-treatment plant."Indeed,"says one researcher."We'll need a lot oftesting to show that they're safe in open waterways,such as at sea.12.The microrobots are powered byA.waterB.sunlightC.plasticsD.pencils13.What does the author focus on in Paragraph 2?A.The purpose of Pumera's project.B.The preciousness of drinking water.C.The seriousness of plastic pollution.D.The working principle of the microrobots14.What shows the effectiveness of the microrobots in lab experiments?A.The weight loss of the plastics.B.The disappearance of the plastics.C.The shape change of the microrobots.D.The improvement in the purity of water.英语试题第5页（共10页）