MCQOPTIONS
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| 1. |
When was the first International Day of Clean Air for blue skies held? |
| A. | 5 September 2020 |
| B. | 6 September 2020 |
| C. | 7 September 2020 |
| D. | 8 September 2020 |
| E. | 9 September 2020 |
| Answer» D. 8 September 2020 | |