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The greenhouse effect gives the earth's surface the   (平均)temperature of 15℃.

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Burning too much coal and oil produces lots of greenhouse gases.  It has become warmer on the earth now than in the past.  Gases put into the atmosphere now will affect the earth years later.  The temperature in a greenhouse is as high as that in the atmosphere.  
no plants would grow on our planet  earth would be thirty degrees colder  man could not live on the earth  all of the above answers are correct  
keep the plants warm.  prevent air pollution.  stop the greenhouse effect.  produce useful gases.  
the way in which gases are used for keeping plants warm  a natural course which is to some degree helpful to us  the way" greenhouse gases trap heat on the earth  the whole course in which greenhouse gases prevent heat  
the greenhouse effect  the burning of fossil fuels  the potential effect of air pollution  the likelihood of a new ice age  
isn’t it    does it    doesn’t it    is it  
shares the same view with the scientists  is uncertain of its occurrence  rejects it as being ungrounded  thinks that it will destroy the world soon  
pollution  few trees  the greenhouse effect  changes in the climate  
predominant  executive  superior  remarkable  
the way in which gases are used for keeping plants warm  a natural course which is to some degree helpful to us  the way" greenhouse gases trap heat on the earth  the whole course in which greenhouse gases prevent heat  

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