Cloze (12 选 10 )请填写字母代号 1__________ to other natural changes, the temperature of the earth is rising rapidly. So 2_________ has this come about and does it matter? All scientists subscribe to the view that the increase in the earth’s temperature is due to the 3__________ of fossil fuels like coal, natural gas and oil to produce energy. Some byproducts are called “greenhouse” gases, the most 4__________ one of which is carbon dioxide. When large amount of extra carbon dioxide is 5__________ to the atmosphere, most heat energy tends to be trapped in the atmosphere causing the global temperature to go up. It was a scientist called Charles Keeling, who made accurate 6__________ of the amount of carbon dioxide in the atmosphere. The 7__________ of scientists towards this rise are completely different. Some think that the trend which increases the temperature would be a catastrophe. Others are opposed to this view and believe that we should not worry about high 8__________ of carbon dioxide in the air. All in all, greenhouse gases continue to 9___________up in the atmosphere. Even if we start reducing the amount of carbon dioxide and other greenhouse gases, the climate is going to keep on warming for decades 10__________ centuries.