MCQOPTIONS
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| 1. |
Which of the following factors causes seasons? |
| A. | Tilted axis of the earth. |
| B. | Revolution of the earth. |
| C. | Both [a] and [b] |
| D. | Either [a] or [b] |
| E. | None of these |
| Answer» D. Either [a] or [b] | |