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There was one thought that air pollution affected only the area immediately around large cities with...

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about 384 000 kilometers  240 000 kilometers  only 348 000 kilometers  about 384 000 meters  
the greenhouse effect  the burning of fossil fuels  the potential effect of air pollution  the likelihood of a new ice age  
has thought    is thought    was thinking    thought  
the one    that    one    it  
about 384 000 kilometers  240 000 kilometers  only 348 000 kilometers  about 384 000 meters  
nothing  many things  everything  little  
A. it    one    that    the one  
the sun  the moon  all the stars  some planets  
refreshing the air  making person upset  adjusting the air humidity  adjusting the air temperature  
the greenhouse effect  the burning of fossil fuels  the potential effect of air pollution  the likelihood of a new ice age  
the moon is 240 kilometer far away  we don't know where it is  it can't fly without air  there is no air on the moon  
So far, rockets with men have been to Other places.  Rockets with men can fly to other places farther away than the moon.  Perhaps one day rockets will be able to go to any place in space.  A plane can fly to the moon.  
If    while   because   as  
one automatic drain serving both containers  two air starting containers of approximately equal size  one control air container and one starting air container  one additional means of starting the main engine  
nothing  many things  everything  little  
So far, rockets with men have been to Other places.  Rockets with men can fly to other places farther away than the moon.  Perhaps one day rockets will be able to go to any place in space.  A plane can fly to the moon.  
the moon is 240 kilometer far away  we don't know where it is  it can't fly without air  there is no air on the moon  
the sun  the moon  all the stars  some planets  

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