MCQOPTIONS
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MCQOPTIONS
| 1. |
__The ozone layer at high altitude contains__ |
| A. | atomic oxygen (O) and ordinary oxygen (O2) |
| B. | only ozone (O3) |
| C. | mixture of atomic oxygen (O), ordinary oxygen (O2) and Ozone (O3) |
| D. | only ordinary oxygen (O2) |
| Answer» D. only ordinary oxygen (O2) | |