MCQOPTIONS
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MCQOPTIONS
| 1. |
Acute danger to human life (i.e. death) exists, if the concentration of CO2 in atmospheric air exceeds ______________ percent (by volume)? |
| A. | 1 |
| B. | 3 |
| C. | 7 |
| D. | 20 |
| Answer» E. | |