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29.Why did people criticize the previous MIA search process?A.Because DPAA wants to continue the search.B.Because it took long and lacked creativeness.C.Because the work was stopped by the militaryD.Because 141 MIAs'remains was found in 2021.30.What is Michael Dolski's attitude to the cooperation with scientists and groups?A.Patient.B.Critical.C.Doubtful.D.Approving.31.What is a suitable title for the text?A.A long search for MIAs.B.Achievements of DPAA.C.Assistance from science.D.Consequences of warsDIn a study in the journal Science,researchers at Northwestern University in Illinoisreported that they had developed an effective and inexpensive method for breaking downchemicals called poly fluoro alkyl substances(PFAS).PFAS,first created in the 1930s,are chemical compounds().They are used tomake a wide range of everyday products,including nonstick pans,carpeting,electronics,andfast-food wrappers.Once the chemicals are in the environment,they are almost impossible toeliminate because they are designed to avoid breaking down.Researchers have linked regularlevels of exposure to these chemicals with several health problems,including liver damage,anincreased risk of cancer,and reduced immunity.Scientists had previously figured out how to remove PFAS from polluted water or soil but,until now,had no safe and effective way to destroy them once they were removed.The studyreported that when the team boiled PFAS molecules (with two common substances,thePFAS quickly broke down and became harmless.In 2020,William Dichtel,a chemist and professor at Northwestern,read a study in whichchemists at the University of Alberta,in Canada,found an easy way to break down chains ofmolecules.He asked a graduate student,Brittany Trang,to try the method on PFAS molecules.Trang had spent months in the lab unsuccessfully attempting to pull apart PFAS,and atfirst she thought Dichtel's idea was too simple to work.But she tried it,boiling PFAS with acommon solvent (called dimethyl sulfoxide (DMSO).Trang was shocked when theprocess destroyed the PFAS.She later mixed DMSO with a chemical called sodiumhydroxideand broke down PFAS even more quickly.The scientists will work on ways to destroy PFAS outside the lab so large amounts offorever chemicals can be broken down at once."It's a huge challenge,but it's in our grasp,"Dichtel told The New York Times.Scientists are also calling for a decrease in the amount ofPFAS being released into the natural world.In June,the US government announced new plansto monitor PFAS,decrease the amount released into the environment,and address the effects ofPFAS on human health.32.What does the underlined word "eliminate"probably mean in paragraph 2?A.Identify.B.Destroy.C.Remove.D.Release.高三英语第6页（共10页）
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