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C-|||-Some scientists say that the weather in the future won`t be good.Summers will be hotter.Warmer,wetter winters are on the-|||-way.Terrible droughts,floods,wildfire,and storms are also possible.-|||-What`s the cause of all those strange weather changes?-|||-Global warming causes some weather changes.Global warming happens when gases in the air trap the sun`s energy.That energy-|||-heats the earth.Without the gases,the energy would go into space.Some global warming is good.Without it.the earth would be too-|||-cold for people to live on.-|||-For years,humans created lots of air pollution.Pollution is one of the reasons for global warming.-|||-There are some signs of global warming. One of the signs is happening in the coldest parts of the world.Near the North and South-|||-Poles,large ice sheets(冰原)are breaking up.Scientists think some may disappear by the year 2100.-|||-As the ice melts,sea level rises.This might cause floods.-|||-In some areas,global warming might cause droughts.Droughts may cause wildfire.-|||-Scientists say that cutting down on air pollution will slow down global warming. One way to lower air pollution is to drive less.-|||-People also need to find cleaner ways to make electricity.-|||-() 52.What will the winter be like in the future according to the scientists?-|||-A.Hotter. B.Drier.-|||-C.Warmer. D.Colder.-|||-() 53.Which is NOT true about global warming?-|||-A.It can cause some weather changes.-|||-B.It is always good for people.-|||-C.Air pollution may cause it.-|||-D.It can cause the ice to melt.-|||-() 54.What may droughts cause according to the passage?-|||-A.Floods. B.Storms.-|||-C.Wildfire. D.Pollution.-|||-() 55.Which of the following CANNOT help slow down global warming?-|||-A.Cutting down on air pollution.-|||-B.Trying to avoid driving.-|||-C.Breaking up some large ice sheets.-|||-D.Finding cleaner ways to make electricity.

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