MCQOPTIONS
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MCQOPTIONS
| 1. |
   The depletion of the ozone layer is caused by |
| A. | Â Â Â Â Â carbon dioxide |
| B. | Â Â Â nitrous oxide |
| C. | Â Â Â Â methane |
| D. | chlorofluorocarbon |
| Answer» E. | |