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B Give his explanation about pork.C.Prove his data analysis of Trichinosis right.D.Find the truth about people with Trichinosis.27.What does the text mainly tell us?A.Adults should set a good example to children.B Children's behavior may cause fear in parents.C.Children often do the opposite of what adults say.D.Parents'words may have lasting effects on childrenThese days,there's a green version of just about everything.There are cars that run onelectricity and alternative fuels,houses that are powered by solar energy and wind farmsseemingly popping up on every open space from California to coastal Japan.Even drones)are getting in on the action.The unmanned air vehicles are also being put to environmen-tal uses around the globe.The eye in the sky that they provide helps researchers better understand what's going onwith the natural world in which we live.For environmentalists and earth scientists,the flyingmachines can be sent way up in the air to record sweeping footage of a large area to track theimpact of things like climate change,migration and the acts of cutting down and burning for-est trees,which can be done without having to buy a helicopter,rent a plane or tape a videocamera to a bird.Sure,there's plenty of satellite footage already out there,but drones let researchers accu-rately position the data set that they want to get a quicker.closer look at the area that they'relooking to monitor.In 2013,for example,the National Aeronautics and Space Administration(NASA)sent a drone into the Turrialba Volcano in Costa Rica to gather data about its emis-sions.The temperature,ash height and gas concentration information collected during themission helped earth scientists determine which way the volcanic and potentially poisonous gaserupting from the volcano was moving and take steps to limit its environmental impact.Similarly,Arctic researchers are using drones to help study temperature change and themelting of glaciers.They use drones equipped with infrared(红s外线的)cameras to sweep intoplaces that they may otherwise not be able to reach to monitor and collect data on the meltingice.The same flying machines may also eventually be used to transport other data collectiontools into the wild.28.How does the author lead in the topic of the text?A.By giving examples.B By listing data.C.By drawing a distinction.D.By making assumptions.【△高三英语第5页（共10页）△】·有听·
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