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प्रश्न
Match the following:
| 1. | Acid rain | a. | Bordetalla pertusis |
| 2. | Eutrophication | b. | Airborne disease |
| 3. | Diphtheria | c. | Green algae |
| 4. | Whooping cough | d. | Nitrogen oxides |
जोड़ियाँ मिलाइएँ
उत्तर
| 1. | Acid rain | d. | Nitrogen oxides |
| 2. | Eutrophication | c. | Green algae |
| 3. | Diphtheria | b. | Airborne disease |
| 4. | Whooping cough | a. | Bordetalla pertusis |
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