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				| 1. | __________ is an environment like __________ where microorganisms are functioning in an extremely thin film of water and where oxygen-containing air is close to them. | 
| A. | low oxygen diffusion environment; soils | 
| B. | high oxygen diffusion environment; soils | 
| C. | low oxygen diffusion environment; lakes | 
| D. | high oxygen diffusion environment; lakes | 
| Answer» C. low oxygen diffusion environment; lakes | |