MCQOPTIONS
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| 1. |
Russia has become the first nation to complete clinical trials of COVID-19 vaccine on humans. It had allowed clinical trials of how many forms of a potential COVID-19 vaccine? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| E. | 6 |
| Answer» B. 3 | |