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29.The flock of sheep will do the following except今力ndn8 yineyardsvingum of mor3C.keeping the ecological balance of the park D.fighting dry seasons and heavy rainfall30.From the last but two paragraph,what can we infer?A.Pompeii is an ancient city.B.Houses in Pompeii are expensive.C.Pompeii has abundant natural resources.D.Peasants in Pompeii grow vegetation effectively.31.When were Pompeii's vineyards dug out?A.In the 1950s.B.In AD79.C.In1748.D.In the 19th century.DTriple threat.Tripledemic.A viral perfect storm.These frightening phrases havedominated recent headlines after relaxing masking,social distancing,and other COVID-19precautions.But a growing body of epidemiological and laboratory evidence offers some reassurance:SARS-CoV-2 and other respiratory viruses often"interfere"with each other.Although waves ofeach virus may stress emergency rooms and intensive care units,the small clique of researcherswho study these viral collisions say there is little chance the trio will peak together andcollectively crash hospital systems the way COVID-19 did at the pandemic's start."Flu and other respiratory viruses and SARS-CoV-2 just don't get along very welltogether,"says virologist Richard Webby,an influenza researcher at St.Jude Children'sResearch Hospital."It's unlikely that they will circulate widely at the same time."One virustends to bully the others.Untying such interference hasn't been easy given the number of respiratory viruses-coronaviruses,rhinoviruses(鼻病毒)，adenoviruses(腺病毒)，RSV,and influenza are justamong the best known-and the many infections that escape notice.Recent advances intechnology,however,make it easier to detect infections in people and study how multipleviruses behave in the lab,in cell cultures or stem cell-derived tissues known as organoids.Increasingly,researchers are fingering a cause:chemical messengers that infected peopleproduce called,fittingly,interferons.When a respiratory virus sweeps through a community,interferons()can broadlyraise the body's defenses and temporarily build a population wide immune barrier againstsubsequent viruses that target the respiratory system."Basically,every virus triggers theinterferon response to some extent,and every virus is subject to it,"says immunologist Ellen【高考冲刺试卷（五）·英语第7页（共12页）】