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六级练习2011.08.05


       
       






With the development of science, scientists have discovered more about the world. (1) ___________________________________. No matter what action is taken, scientists say there are already enough greenhouse gases in the atmosphere to cause a major warning. As a result, scientists and government officials are focusing on how society might adapt to rising sea levels, changing agricultural zones, changing climates and other problems. Already, state and local governments along the coast of the United States are starting to plan for a possible long-term rise in the sea level, and a few have taken action to cope with it. (2) _________________________________________. How long it will take for maximum warming to be reached is uncertain because the oceans slow such warming. Most scientists expect the maximum warming to take place by the second half of this century. (3) ______________________________________________. Some leading experts expect a rise of 1 meter, a little more than three feet



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1 scientists say world coast areas must prepere now  for a rise in sea levels .

2agricultural researchers are developing heat resistance and drop resistance crowds that may replace traditional crowd if the climate changes.
3if levels of greenhouse gas in the air sphere double  sea levels will rise.As rise are from  to 1.5feetto 6.5feet.
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