Условие задания:

4,5 Б.
Listen to the text "Ozone layer".
 
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Write the ending:
 
1. Global warming became a  .
 
2. We all know today that the thinning ozone layer is perhaps the most serious crisis  .
 
3. That would be  .
Источники:
http://www.pbs.org/newshour/rundown/ozone-layer-asia-threatened-weird-pumping-effect-atmosphere/