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- 2013-5-30
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- 1970-1-1
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Part I Main idea: The passage illustrates the history of discovering CFC destroy ozone and its relationship with climate changes through 1970 to 1989.
Part II
[Time 2]2:44 [366Words]
The author described the experience that he, along with his team discovered the changes of nature brought by building E dam.
[Time 3]2:19 [300Words]
One year later, the author came back to the E river, and he unexpectedly found the transform and restoration of the nature, with salmon even returning.
[Time 4]2:55 [338Words]
H is so strong that it has been ranked at the highest category of tropical cyclones during the history.
The scientists are not sure why H is so powerful, and there is no trend that tropical C will toward stronger category. But it is likely that global warming can affect the tropical C.
[Time 5] 2:27[306Words]
Scientists recently found that there are two layers below the earth surface, with the lower layer twice as dense as the top one. Also, from experiments, they reckon that the carbon structure in the deep earth is different from that of top ground.
[Time 6]1:48 [215Words]
Fossils show that when warm weather came, the mammal became smaller, and after the temperature reverted, they returned to their original sizes.
Part III
[Time 7] 9:56[1275Words]
Two Scientist recently discovered that the somatic mutation is not happened randomly, the theory surprised the world.
How did they prove the founding.
The significance of this discovery.
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