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(chǎn)→b→c→d→e                   B．e→b→c→d→a
C．a(chǎn)→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(chǎn) 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 這篇文章主要講了二氧化碳的排放引起海水化學(xué)物質(zhì)的改變從而是海洋動物受到危險．

解答 29．A 主旨大意題：從第一段的句子：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．可知文章主要講的是海洋生物正在遭遇危險．故選A
30．B 排序題 根據(jù)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，先是大氣中的二氧化碳含量增加，排除A、C；接著是二氧化碳被海水吸收，影響海水的化學(xué)平衡，隨著酸性物質(zhì)的形成，海水的PH值下降，給海洋生態(tài)環(huán)境帶來威脅，故選B．
31．A 細節(jié)題理解．從第二段和第六段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．"可知科學(xué)家 Robert Dore 是根據(jù)自己的研究和分析得出結(jié)論的．所以答案是A 
32．D 推理判斷題．文章最后一段主要是告訴我們現(xiàn)在海洋的狀態(tài)，對整個海洋生物有著不好的影響，存在可能的危險．所以可以推斷文章想要告訴我們，必須采取措施，防止災(zāi)難發(fā)生．故選擇D．

點評 本文是一個科教類閱讀理解，題目涉及多道細節(jié)理解題，做題時結(jié)合原文和題目有針對性的找出相關(guān)語句進行仔細分析，結(jié)合選項選出正確答案．推理判斷題也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確答案，切忌胡亂猜測，一定要做到有理有據(jù)．