Question

7．Rising levels of carbon dioxide in the atmosphere are a major cause of climate change，and now a new study has confirmed that atmospheric CO₂ is also affecting the ocean chemistry and potentially harming sea life．
Montana State University scientist Robert Dore has been researching the water in the Pacific Ocean for almost two decades．
"We've been going to the same spot in the Pacific Ocean，and we try and characterize long-term change in the open ocean environment．And one of the key things that we measure is CO₂ levels．And we've b een able to record this increasing quantity of atmospheric CO₂ into the ocean．"
Scientists expected that as atmospheric CO₂ increased，more and more of the carbon dioxide would be absorbed into the ocean，affecting the chemical balance of the sea water，with a potentially harmful impact on shellfish and coral in particular．
"As carbon dioxide dissolves in the water，or seawater in this case，it forms a weak acid （酸），carbonic acid，"Dore explains．"And therefore，as the concentration of CO₂ in the atmosphere goes up and that exchanges with the surface seawater，it drives the pH down，and makes it more acidic．"
The seawater Dore and his colleagues have analyzed confirms what the theory predicts．
The effect was particular striking at about 250 meters down，and again at 500 meters．Dore and his colleagues came up with two possible explanations．It could be that surface water picked up CO₂ and then moved to those depths．Or there could be a biological explanation．"It's important to realize that the oceans are really becoming acidic．And it can have negative impacts on a whole variety of sea life from fish to coral．It's potentially catastrophic．"
29．What can be the best title of the passage？A
A．Sea Life Facing Danger          
B．Scientist Researching Seawater
C．Oceans Becoming More Acidic     
D．Climate Change Affecting Seawater
30．Which of the following shows the process of the impact of atmospheric CO₂ on sea life？B
    a．Sea life is endangered．
    b．CO₂ goes into the surface water．
    c．The ocean chemistry is affected．
    d．CO₂ decreases the pH and makes the seawater more acidic．
    e．CO₂ levels in the atmosphere go up．
A．a→b→c→d→e                   B．e→b→c→d→a
C．a→e→c→d→b                   D．e→d→c→b→a
31．Scientist Robert Dore came to the conclusion based onA．
A．his research and analysis        B．the expectation of other scientists
C．some former theory               D．a major cause of climate change
32．What does the passage want to tell us most？D
A．It takes time to make a scientific study．
B．Atmospheric CO₂ is doing harm to sea life．
C．Robert Dore is a committed and serious scientist．
D．Measures should be taken to prevent the potential catastrophe．

Answer 1

分析 这篇文章主要讲了二氧化碳的排放引起海水化学物质的改变从而是海洋动物受到危险．

解答 29．A 主旨大意题：从第一段的句子：Rising levels of carbon dioxide in the atmosphere are a major cause of climate change，atmospheric CO₂ is also affecting the ocean chemistry and potentially harming sea life．可知文章主要讲的是海洋生物正在遭遇危险．故选A
30．B 排序题 根据第三、四段"as atmosphere CO2 increased，more and more of the carbon dioxide would be absorbed into the ocean，affecting the chemical balance of the sea water…As carbon dioxide dissolves in the water or seawater in this case，it forms a weak acid，carbonic acid，it drives the pH down，and makes it more acidic"可知，先是大气中的二氧化碳含量增加，排除A、C；接着是二氧化碳被海水吸收，影响海水的化学平衡，随着酸性物质的形成，海水的PH值下降，给海洋生态环境带来威胁，故选B．
31．A 细节题理解．从第二段和第六段Montana State University scientist Robert Dore has been researching the water in the Pacific Ocean for almost two decades…The seawater samples Dore and his colleagues have analyzed confirm what the theory predicts．"可知科学家 Robert Dore 是根据自己的研究和分析得出结论的．所以答案是A 
32．D 推理判断题．文章最后一段主要是告诉我们现在海洋的状态，对整个海洋生物有着不好的影响，存在可能的危险．所以可以推断文章想要告诉我们，必须采取措施，防止灾难发生．故选择D．

点评 本文是一个科教类阅读理解，题目涉及多道细节理解题，做题时结合原文和题目有针对性的找出相关语句进行仔细分析，结合选项选出正确答案．推理判断题也是要在抓住关键句子的基础上合理的分析才能得出正确答案，切忌胡乱猜测，一定要做到有理有据．