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				| 1. | How much radiation energy percentage radiating on plant isused in photosynthesis ? | 
| A. | 0-50%-210% | 
| B. | 0-25%-0-30% | 
| C. | 0-42%-1•66% | 
| D. | 0-16%-0-24% | 
| Answer» D. 0-16%-0-24% | |