6.Rising levels of carbon dioxide in the atmosphere are a major cause of climate change,and now a new study has confirmed that atmosphere CO2is 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 CO2levels.And we've been able to record this increasing quantity of atmosphere CO2into the ocean."
Scientists expected that as atmosphere CO2increased,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,carbonic acid,"Dore explains."And therefore,as the concentration of CO2in the atmosphere goes up and that exchanges with the surface seawater,it drives the pH down,and makes it more acidic."
The seawater samples Dore and his colleagues have analyzed confirm what the theory predicts.
The effect was particular striking at about 250meters down,and again at 500meters.Dore and his colleagues came up with two possible explanations.It could be that surface water picked up CO2and 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."
59.What can be the best title of the passage?B
A.Scientist Researching Seawater
B.Sea Life Facing Danger
C.Oceans Becoming More Acidic
D.Climate Change Affecting Seawater
60.With the increase of atmospheric CO2,B.
A.more corals will appear in the sea
B.the chemical balance of the seawater is affected
C.the surface water is becoming warmer
D.the pH of the ocean out here has been increasing
61.Which of the following shows the process of the impact of atmospheric CO2on sea life?B
a.Sea life is endangered.
b.CO2goes into the surface water.
c.The ocean chemistry is affected.
d.CO2decreases the pH and makes the seawater more acidic.
e.CO2levels in the atmosphere go up.
A.a(chǎn)→b→c→d→e B.e→b→c→d→a
C.a(chǎn)→e→b→c→d D.e→d→c→b→a
62.Scientist Robert Dore came to the conclusion based onC.
A.the expectation of other scientists
B.some former theory
C.his research and analysis
D.a(chǎn) major cause of climate change.
分析 本文是一篇科普類文章,主要講述了大氣中二氧化碳水平上升是氣候變化的主要原因,現(xiàn)在一項新研究證實,大氣中二氧化碳也影響了海洋化學(xué)并有損害海洋生物的潛在可能.本文以此展開談?wù),介紹了科學(xué)家Robert Dore通過研究分析得出的結(jié)論.
解答 59.答案:B.主旨大意題.通讀全文可知,本文主要講述了大氣中二氧化碳水平上升是氣候變化的主要原因,現(xiàn)在一項新研究證實,大氣中二氧化碳也影響了海洋化學(xué)并有損害海洋生物的潛在可能.故標(biāo)題為Sea Life Facing Danger更貼切.故選B.
60.答案:B.細節(jié)理解題.根據(jù)"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"可知,隨著CO2的增加,影響了海水中的化學(xué)平衡.故選B.
61.答案:B.細節(jié)理解題.根據(jù)"As carbon dioxide dissolves in the water or seawater in this case,it forms a weak acid,carbonic acid"和"And therefore,as the concentration of CO2in the atmosphere goes up and that exchanges with the surface seawater,it drives the pH down,and makes it more acidic"可知,正確的順序為"CO2 levels in the atmosphere go up-CO2 goes into the surface water-The ocean chemistry is affected-CO2 decreases the pH and makes the seawater more acidic-Sea life is endangered".故選B.
62.答案:C.推理判斷題.根據(jù)"The seawater samples Dore and his colleagues have analyzed confirm what the theory predic"及文章內(nèi)容,可推測出,科學(xué)家Robert Dore 是通過研究和分析得出結(jié)論的.故選C.
點評 本文是一篇科普類閱讀,題目涉及主旨大意題,細節(jié)理解題,推理判斷題,做題時應(yīng)結(jié)合文章上下文內(nèi)容并根據(jù)所給選項的含義進行分析,從而得出正確答案.切記胡亂猜測,一定要做到有理有據(jù).