MCQOPTIONS
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				| 1. | 
                                    Which one of the following substances is easily decomposed by microorganisms? | 
                            
| A. | A plastic comb | 
| B. | A copper plate | 
| C. | A steel bottle | 
| D. | An apple | 
| E. | None of these | 
| Answer» E. None of these | |