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28.What is the probable reason why humpback whales sing according to the new study?D.Hopelessness.A.Loneliness.B.Hunting.C.Danger.29.What is Dunlop'ssuprising discovery in her researc?A.Humpback whales always keep silent.B.The more humpback whales,the less singing.C.The number of humpback whales increases sharply.D.The farther humpback whales'songs go,the better.30.What is the purpose of male humpback whales'singing based on the first discovery?A.To sound a warning.B.To shout for help.C To leave for their home.D.To show off their strength.31.What does the underlined word"iminished"in the last paragraph mean?A.Let in.B.Let down.C.Cut in.D.Cut down.DRestaurants,farmers and food businesses are turning to chemistry and physics to dealwith the problem of food waste.Some companies are testing coverings to slow the fruits'ripe-ning (process and packets to keep food fresh.Others are developing digital sensors thatcan tell when meat is safe to eat.Experts say growing awareness of the costs of food waste has led to more efforts to dealwith the problem.ReFED is a group that studies food waste.It estimates 225,000 kilogramsdof food can be kept out of waste areas each year with special high-tech coverings.But the cost can be a barrier for some companies and shoppers.Kroger,the largestfood-store company in the US,ended its deal with Apeel Sciences in 2022.The deal endedbecause Kroger said shoppers were not willing to pay more for fruits with Apeel's specialcovering to keep them fresh.Many companies are working on ways to help reduce food waste.A Sweden-based compa-ny is trying developing a sensor that can show if meat is safe toeat by measuring the buildupof bacterianidnir And Ryp Labs,based n the US and Belgium,isworkingnsticker o fitsand vegetables that would release (gsoipeSome companies find it better touse proventechnology innewways.FrCheago-basedHaze Technologies has bn rying sechmicl compund(f化合物)，clMCP,whih isdinroomthe ritsripeng roeThe compyowsells packets that ca slwyrelease I-MCP into smllnf frutThe inco butor of theCabrer Shehrrof for the R een ConM oodhmReducing food sizes,buing amnler qunterthe eryotfreshness date could have even more effects than new technology.Overall as a society,wedon food as it should be valued,"Cabrerid笔6页（共10页）】·23-503A