問題詳情

三、篇章結構 20% Deep in the jagged red mountains of Oman, geologists are drilling in searchof the holy grail of reversing climate change: an efficient and cheap way toremove carbon dioxide from the air and oceans. They are coring samples fromone of the world's only exposed sections of the Earth's mantle to uncover how aspontaneous natural process millions of years ago transformed CO2 intolimestone and marble.  (21) But some researchers are also testing ways to remove or recyclecarbon already in the seas and sky. The Hellisheidi geothermal plant in Iceland injects carbon into volcanic rock.(22) In all, 16 industrial projects currently capture and store around 27million tons of CO2, according to the International Energy Agency. That's lessthan 0.1 percent of global emissions — but the technology has shown promise. Any one technique is not guaranteed to succeed, so geologists have got to trya lot harder and do a lot more and a lot of different actions. One such action isunderway in the al-Hajjar Mountains of Oman, in a quiet corner of the ArabianPeninsula, where a unique rock formation pulls carbon out of thin air.(23) The mantle contains peridotite, a rock that reacts with the carbonin air and water to form marble and limestone. Every single magnesium atom inthese rocks has made friends with the carbon dioxide to form solid limestone,magnesium carbonate, plus quartz. (24)Rain and springs pull carbon from the exposed mantle to form stalactites andstalagmites in mountain caves. Natural pools develop surface scum of whitecarbonate. (25) For a geologist, this is supersonic. 
(A) There's about a billion tons of CO2 in the mountain. 
(B) The sultanate boasts the largest exposed sections of the Earth's mantle, thrustup by plate tectonics millions of years ago. 
(C) Scratch off this thin white film, and it'll grow back in a day. 
(D) As carbon dioxide is the primary greenhouse gas driving climate change, theworld researchers have been wasting no time finding the cure. (AB) As the world mobilizes to confront climate change, the main focus has beenon reducing emissions through fuel efficient cars and cleaner power plants. (AC) At the massive Sinopec fertilizer plant in China, CO2 is filtered and reusedas fuel.
21

參考答案

答案：A,B
難度：困難0.272727
統計：A(3),B(4),C(1),D(1),E(0)

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