根据课文内容,完成下 根据课文内容,完成下列短文. When

根据课文内容,完成下
根据课文内容,完成下列短文.
When 1 ( compare) with most natural changes,that the temperature of the earth rose about one degree
Fahrenheit during the 20th century is quite shocking.And it's human activity 2 has caused this 3 (全球
的)warming rather 4 a random but natural 5 (现象):Dr Janice Foster explains that we add huge 6 of
extra carbon dioxide to the atmosphere by burning fossil fuels.From the second 7 (图表) and the discovery
of Charles Keeling,all scientists believe that the burning of more and more fossil fuels has resulted 8 the
increase in carbon diox ide.Greenhouse gases continue to build up.Some think that the trend would be a 9 (灾难).On the other hand,George Hamb ley 10 (声明) that more carbon dioxide would encourage a greater
range of animals and bring us a better life.
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