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places that are very,very remote,that have had less contact with modernity,less access toroads,"hesays.28.Why are the linguists studying whistled speech?A.To think of it as a special language.B.To have a knowledge of how to use it.C.To know how people understand it well.D.To know the sound elements.29.How is Paragraph 3 mainly developed?A.By giving examples.B.By making comparisonD.By introducing a topic.C.By analyzing facts.30.What do we know about whistled language from Paragraph 5?A.It's a developed language.B.It's a widely-used language斯C.Linguists are still studying it.D.Linguists find it easy to learn.31.What does the underlined word"vanished"mean in the last paragraph?A.Existed.B.Arisen.C.Disappeared.D.Improved.D如What is the purpose of lightning?Many are familiar with the potentially deadly dangers posed bylightning,which is blamed for an average of 43 deaths in the United States each year,based on datafrom 1989 to 2018.Although the odds of being struck are quite low-1 in 1,222,000 in a given yearand 1 in 15,300 in a lifetime-many in the weather community have long urged people to take properprecautions to stay safe amid storms,which can frequently cause lightning,even without turning severe.However,the researchers recently uncovered a surprising and beneficial impact of lightning.TheEarth is struck by lightning nearly 20 million times each year,and bolts of lightning can travel as much紫as 10 to 12 miles from a thunderstorm,instantly heating the air to 50,000 degrees Fahrenheit.Essen-区tially,lightning occurs due to the buildup of electric charges in the atmosphere.In order to balance outthe different charges,lightning is caused between two clouds or between a cloud and the ground.The study was based on an airborne research flight conducted by a storm-chasing plane.The plane郑was used to examine the top portion of thunderstorm clouds.Researchers initially thought there was a拓problem with the equipment on the plane,which was being used to measure the hydroxyl radicals in the杯atmosphere until they realized spikes they observed corresponded with lightning flashes.Researchers previously understood that lightning could help to clean the atmosphere,but there wasno evidence that it could generate compounds like these radicals.And the data showed surprising spikes脚of up to 1,000 more hydroxyl radicals than the normal value.As a result,the study estimates that some-where between 2%and 16%of the cleaning that happens naturally in the Earth's atmosphere,is doneby lightning.Why is this significant?The cleaning process helps toreduce chemicals like cabon monoide andmethane in the atmosphere.These chemicals,known for being greenhouse gases,have been proven tocontribute to rising temperatures associated with climate change.3.ydeaths id lingsnthe United Stte rom 18A.Less than 1,000.C.About 1,600.B.About 1,300.D.More than 2,00033.What made researchers doubt the equipment on the plane?A.The buildup of the electronic charges in the atmosphere.B.The increasing amount of hychoxyl radicals.C.The times of lightning flashesD.The top portion of thunderstorm clouds.34.How does lightning clean the atmosphere?A.By generating methane in the atmosphere