第四篇

• 1、

  Paragraph 1 _____

• 2、

  Paragraph 2 _____

• 3、

  Paragraph 4 _____

• 4、

  Paragraph 5 _____

• 5、

  Methane is ___________ to the intensifying greenho

• 6、

  Greenhouse gases are indispensable to mankind,but

• 7、

  Generally people heap criticism on __________ for

• 8、

  Nothing has been mentioned in the passage about __