题目内容：
Questions 36 to 45 are based on the following passage.The oceans have always served as a sink for carbon dioxide, but the burning of fossil fuels since the beginning of the industrial revolution, especially over the last 40 years, has given them more than they can___36 ___absorb. The result is that the oceans are becoming acid--a change in the___37___ balance that threatens the oceans' web of life.
In earth's history, there have been many___38___ of acidification, mainly from volcanic eruptions (火山喷发).According to a new research review by pale oceanographers at Columbia University, published in Science, the occammay be___39___ acid far faster than at any time in the past 300 million years. Changing something as___40___ as the PH of seawater has proof and effects. Increased acidity attacks the shells of shellfish and the skeletal foundation of corals (珊瑚), dissolving the calcium carbonate (碳酸钙) they're made of. Coral reefs are among the most diverse ecosystems on the planet. Ocean acidification___41___ the corals and everyother___42 ___that makes its living on the reefs.
The authors tried to determine which past acidification events___43___ the best comparison to what is happening now. The closest analogies are disastrous events, often associated with intense volcanic activity resulting in major extinctions. The difference is that those events___44___ thousands of years. We have acidified the oceans in a matter of decades, with no signs that we have the political will to slow, much less halt, the___45.___
第36题_______
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