Question

阅读理解

阅读下面短文，从每题所给的四个选项(A，B，C和D)中，选出最佳选项。

　　Some scientists warn that ice near the Earth's Poles may indeed be melting. This “polar melting down” may be the first sign that the Earth is heating up. We could be in very serious trouble if this tread continues. It is estimated that a meltdown of as little as 10 percent of Antarctica's ice would raise sea levels around the globe by 4 to 9 meters. Floods would cover low-lying regions and turn coastal cities like New York and New Orleans into real life underwater world.

　　Scientists first predicted in the 1970s that heat trapped in the Earth's atmosphere could cause a polar meltdown. Many now believe that human activities are turning up the heat. When we burn fossil fuels like coal and oil, we add carbon dioxide (二氧化碳) gas to the Earth's atmosphere. Cutting down trees also makes carbon dioxide levels rise because trees normally soak up carbon dioxide to make food. Scientists say higher carbon dioxide levels strengthen the “green house effect” and could increase the Earth's temperature. In fact, carbon dioxide levels have risen by 30 percent since the Industrial Revolution of the 18th and 19th centuries.

　　Over the past three years, satellite measurements have shown a sea-level rise of about a quarter inch worldwide. “If nothing is done to reduce fossil-fuel pollution and global warming, sea levels will rise even more.” Says geologist Richard Alley.

　　But even Alley admits that a polar meltdown would take time. The ice in Antarctica and Arctic locks up nearly nine times the volume of water contained in all the world's rivers and lakes. These are such big “ice cubes” and it would probably take thousands of years to melt them.

1．What consequence (后果) of global warming is mentioned in the passage?

[　　]

A．More tropical storms.

B．More tropical diseases.

C．Changes in farm productivity.

D．Coastal flooding.

2．Which of the following statement does the second paragraph support?

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A．Carbon dioxide in the atmosphere cannot keep the heat from escaping into space.

B．The increase of carbon dioxide gas may warm the planet and help to melt polar ice.

C．Cutting down trees helps to greatly reduce carbon dioxide levels.

D．The end of the short-lived age of fossil fuels is already in sight.

3．Geologist Richard Alley most likely agrees that ________.

[　　]

A．the sea-level rise can be prevented by cutting back on energy consuming activities

B．The recent breaking off of ice blocks from Antarctica is just a natural part of a long-term cycle

C．Antarctica temperatures have significantly changed since the Industrial Revolution

D．The polar meltdown may be an accidental change of climate rather than a sign of global warming

4．In which paragraph does the author mention the large quantities of polar ice?

[　　]

A．In the second paragraph.

B．In the third paragraph.

C．In the fourth paragraph

D．In the fifth paragraph.

Answer 1

答案：D;B;A;C
解析：

1．细节理解。由本文第一段末句：Floods would cover low-lying regions and turn coastal cities like New York and New Orleans into real life underwater world. 可以判定。 　　2．主旨大意。由第二段第5句：Scientists say higher carbon dioxide levels strengthen the “greenhouse effect and could increase the Earth's temperature.” 　　3．细节理解。由本文第三段中的直接引语：“If nothing is done to reduce fossil fuel pollution and global warning, sea levels will rise even more.” 　　4．细节理解。由本文第四段中第二句：The ice in Antarctica and Arctic locks up nearly nine times the volume of water…，可以判定．