MCQOPTIONS
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				| 1. | 
                                    Acid rain is caused by release of _____ and ______ into the air.A. Carbon dioxide and carbon monoxideB. Sulphur dioxide and nitrogen oxidesC. Oxygen and water vapourD. Nitrous oxide and ozone | 
                            
| A. | C | 
| B. | D | 
| C. | B | 
| D. | A | 
| Answer» D. A | |