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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:1766

- Air_______ is one of the biggest problems in the world today
- Yes. We must take action to make the air less_______.

A.pollution; pollution B.pollute; pollution
C.pollution; pollute D.pollution; polluted
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Airisoneofthebiggestproblemsin