MCQOPTIONS
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				| 1. | 
                                    The green house effect may increase on earth because | 
                            
| A. | The earth tills toward the sun in the summer | 
| B. | Increasing carbon dioxide will trap more heat | 
| C. | Too much oxygen is now given off by plants | 
| D. | Decomposes essential recycling matters are being destroyed | 
| Answer» C. Too much oxygen is now given off by plants | |