MCQOPTIONS
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| 1. |
A dendrochronologist observed total 22 ring of spring wood and autumn wood in a dicot stem in 1998. How many annual rings will be observed by him in 2007? |
| A. | 21 |
| B. | 25 |
| C. | 20 |
| D. | 30 |
| Answer» D. 30 | |