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Question
Math the following.
| 1. | Nitrogen | Air pollution |
| 2. | Balloon | Smoke and fog |
| 3. | Smog | 78% |
| 4. | Lung cancer | Air |
Match the Columns
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Solution
| 1. | Nitrogen | 78% |
| 2. | Balloon | Air |
| 3. | Smog | Smoke and fog |
| 4. | Lung cancer | Air pollution |
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