MCQOPTIONS
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| 1. |
Carbon dioxide is one of the gases that cause the _________._x005F_x000D_ |
| A. | greenhouse effect_x005F_x000D_ |
| B. | ozonification_x005F_x000D_ |
| C. | oven phenomenon_x005F_x000D_ |
| D. | sunburn_x005F_x000D_ |
| Answer» B. ozonification_x005F_x000D_ | |