Question

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 been 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（溶解） in the water, or seawater in this case, it forms a weak acid, 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（消极的） impacts on a whole variety of sea life from fish to coral. It's potentially catastrophic."

1.What can be the best title of the passage?

    A．Sea Life Facing Danger          

B．Scientist Researching Seawater

    C．Oceans Becoming More Acidic     

D．Climate Change Affecting Seawater

2.With the increase of atmospheric CO₂，         .

    A．more corals will appear in the sea

    B．the surface water is becoming warmer

    C．the chemical balance of the seawater is affected

    D．the PH of the ocean out here has been increasing

3.Which of the following shows the process of the impact of atmospheric CO₂ on sea life?

    a．Sea life is endangered．

    b．CO₂ goes into the surface water．

    c．The ocean chemistry is affected．

    d．CO₂decreases the PH and makes the seawater more acidic．

e．CO₂ levels in the atmosphere go up．

4.Scientist Robert Dore came to the conclusion based on        .

    A．his research and analysis

    B．the expectation of other scientists

    C．some former theory

    D．a major cause of climate change  

 

Answer 1

【答案】

 

1.A

2.C

3.B

4.A  

【解析】

试题分析：

1.主旨题：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。选A

2.细节题：从第四段的句子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."可知海水的化学平衡收到影响。选 C

3.排序题：从第五段可知这个过程。选B

4.细节题：从第二段和第六段可知答案是A  

考点：考查科普环保类文章

点评：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，题型多样，细节题，主旨题，还有很新颖的表格题，学生即要求把握主旨，也要留意细节。