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阅读下面材料,在空白处填入适当的内容(1个单词)或括号内单词的正确形式。

The earth is becoming warmer. How has this come about? There is no doubt that 1. is human activity that has caused this global warming rather than a 2. (nature) phenomenon.

All scientists subscribe to the view that the temperature rise is due to the 3. (burn) of fossil fuels to produce energy. Some byproducts of this process are called “greenhouse” gases, the most important one of 4. is carbon dioxide. Without the “greenhouse” effect, the earth 5. (be) too much cooler than it is. So we need those gases. 6. when we add huge quantities of extra carbon dioxide into the air, the problem occurs. More heat energy 7. (trap) in the air causes the global temperature to go up.

However, the attitudes of scientists towards the temperature rise are 8. (complete) different. Some think the ongoing rise will lead to disasters while others are opposed 9. the view. They even think more carbon dioxide is actually a positive thing.

Who are right? Only when the fact comes out, 10. we know it.

高二英语语法填空中等难度题

少年,再来一题如何?
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