题目内容
阅读下面材料, 在空白处填入适当的内容(一个单词)或括号内单词的正确形式。
All scientists subscribe to the view that the increase in the earth’s temperature is 1. to the burning of fossil fuels like coal, natural gas and oil to 2. (production) energy. Some byproducts of this process are called “greenhouse” gases, the most important one of 3. is carbon dioxide. Dr Janice Foster explains: “There is a natural phenomenon that scientists call the ‘greenhouse 4. ’ (effective). This is 5. small amounts of gases in the atmosphere, like carbon dioxide, methane and water vapour trap heat from the sun and 6. warm the earth. 7. the ‘greenhouse effect’, the earth would be about thirty-three degrees Celsius 8. (cool) than it is. So, we need those gases. The problem begins when we add huge quantities of extra carbon dioxide into the atmosphere. It means that more heat energy tends 9. (trap) in the atmosphere 10. (cause) the global temperature to to up.”