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32 WheofFewer thn 100 cent papers about them have been published toatefaldh niverity of Wango cite two studiesomChinahowing that yedsmornnboubanr pollution.Therere unknown chemicalspresent in these things that are ending up in our lungs.'Experts call for more transpareney from the tyre companies."But the formula is what gives a manufacturermSharing ingredients is difficult and complicated.Very few people,except manufacturers.know whats in the tyres,"sad Allen."When it comes to microplastic,we don't know what a safe level is and wemay have alrea小passed it.”28.What did the global model find about car tyres?AA.They auge more pollution to the sea than to nvers.B.Their sxact composition can be tracked downC.Tyre particles are one of the largest sea pollutants.D.They have daused great risk to human survival.ht does the uderined word "ubiquitous in pargph3men?A.Widespread.B.Dangerous.C.Complex.D.Unique30.What can we infer from Edwad'words?A.The two studies from China are leading the fashion.B.The unknown chemicals in the air are dangerous.C.Tyre particles are a major pollutant in the air in cities.D.Further research should be done about tyre particles.31.What is the text mainly about?CA.Tyres are to blame as a pollutant in the ocean.B.Tyre companies should act against microplastic.C.Tyre dust becomes a huge threat to ocean life.D.Safety levels of microplastic have been raised.DWhile the ability to copy sounds is uncommon among animals,only a few species can adjust their voice tosound higher or lower.Seals are one of these animals and they copy humans like parrots.They change the pitch(of their calls depending on the sounds of their surroundings.Now scientists have found baby seals are on the short list of animals with volume control."By looking at sealswhich may be capable of learning sounds,we hope to understand how humans acquire speech and finally why weare such chatty animals,"said Dr.Ravignani,one of these scientists.The scientists studied eight harbor baby seals whieh-were being held in a center before being released back intothe wild.They recorded noises from the nearby sea before playing them back to these seals at volumes ranging fromno sound to higher sound,but keeping the same tone height as the animal's calls.They then recorded the babysealscallsto see whether they changed their tone of voice to match these sounds.Baby seals lowered their tone ofvoice when they heard louder sea noises.But one of them displayed the so-called Lombard effect,producing loudercalls when the noise got louder.This is also typical of human speech,as people generally raise their voices to bebetter understood in noisy situationsBaby seals have a more advanced control over their calls than assumed up.This control seems to be alreadypresent at an early age.This is astonishing,as few other animals seem capable of that.However,baby seals didn'tproduce more or longer calls when exposed to different levels of sea sounds.Dr.Ravignani said,"To date,humans seem to be the only mammals with direct connections between thecorex-the outer layer of the brain,and the larynx-what we use to produce tone of voice.These results show thatsealsmay be the most promising species to find these direct connections and uncover the mystery of speech."英语第5页（共8页）智慈上进