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28.What do we know about microplastic particles from paragraph 1?A.They are too small to be seen.B.They are products of plastic ballsC.They have been ignored for long.D.They can be made into almost everything.29.What does Dr.McReynolds focus on in his study?A.Classifying plastic particles into subsets.B.Finding solutions to plastic pollution.C.Charting the tides and currents of oceansD.Creating a data collection for microplastics.30.What does a seagull's pecking at the picture prove?A.The interesting teachable moments.B.The harmful effect of microplastic particles.C.The spread of poisonous chemicals.D.The beauty of the photo of microplastic particles.31.What does Dr.McReynolds expect of his work?A.To educate the public.B.To provide solutions.C.To preserve the earth.D.To save the world.DA team of researchers at ETH Zurich has the perfect long-lasting solution toour fog problem.They have developed a very thin and gold-based transparentcoating (that can convert sunlight into heat,which can be applied to glassesand other surfaces to prevent them from fogging.The special coating is developed using titanium oxide(二氧化钛)and goldparticles.It selectively absorbs infrared radiations(红外线照射)from the sunlightand creates a heating effect that is powerful enough to keep fog away from thesurface of an object.The coating basically employs heat to stop fogging.The coatingabsorbs a large part of the infrared radiation,which causes it to heat up-by up to8℃.Previously,products like anti-fogging sprays create a very thin film of wateron the surface to remove fog.The problem with such surfaces is pollution.Alongwith water,the sprays also attract dirt,dust,oil,and various other dirtysubstances,and just a little dirt on the surface makes it useless.However,the newcoating repels (water.Furthermore,the coating is significantly thinner,which makes it more transparent as well as flexible.It is heated passively andrequires,during daytime,no additional energy source.Gold might be expensive,but the researchers stress that their coating requiresso little that the material costs remain low.Their coating is produced withstandardized and readily scalable methods,all cost-effectively.However,althoughthis product can work at very low levels of solar irradiation,it does rely on acertain amount of light.英语试题第6页（共10页）
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