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【填空题】

听下面一段对话,完成第16题至20五道小题,每小题仅填写一个词。听对话前,你将有20秒钟的时间阅读试题,听完后你将有60秒钟的作答时间。这段对话你将听两遍。
  
What has been done to reduce pollution?by Jane & Petergovernment:  have tighter pollution ______ 180 countries signed an agreement to reduce their ______ gasescar producers: design cars that use  ______  gas design cars powered by the ______ people:      walk or  ______  to work.
 

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