MCQOPTIONS
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| 1. |
The northern boundary of the cotton belt of the United States is determined by? |
| A. | by 100 frost-free days |
| B. | 210 by frost free day |
| C. | 100 cm. by the rain line |
| D. | 200 cm. by the rain line |
| Answer» C. 100 cm. by the rain line | |