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Hundreds of feet beneath Earth’s surface, a few seasoned cave explorers venture where no human has set foot Their headlamps illu

admin2015-04-10  3
问题     Hundreds of feet beneath Earth’s surface, a few seasoned cave explorers venture where no human has set foot Their headlamps illuminate mud-covered walls, gypsum crystals and mineral deposits. The real attraction, though, is under their shoes. A massive formation that resembles a white river spans the cave’s floor. A closer examination reveals that the odd formation is an intricate crust of tiny calcite crystals. The veteran explorers have reached Snowy River—thought to be the longest continuous cave formation in the world.
    "I think Snowy River is one of the primo places underground in the world and there’s still so much left that we haven’t discovered. We don’t even know how big it is," said Jim Goodbar, a cave specialist with the federal Bureau of Land Management. The survey expedition by members of the Fort Stanton Cave Study Project in early July added several thousand feet to the measurement of the spectacular formation, which is at least four miles long. The explorers who have been following the passage under the rolling hills of southeastern New Mexico say there’s still more of Snowy River to be discovered.
    The few who have walked on the formation say they’ve seen nothing else like it. Early studies point to its uniqueness: Already, some three dozen species of microbes previously unknown to science have been uncovered. New Mexico’s two U. S. senators are pushing for Congress to designate Fort Stanton Cave and Snowy River as a national conservation area. The designation would protect the area from such activities as mining that threaten the water flows that created the cave. It also might generate funding for scientific research.
    Last summer, explorers were surprised to arrive at Snowy River and find it flowing with water. It had been dry when first discovered in 2001 and during trips in 2003 and 2005. It took several months for Snowy River to dry out, leaving scientists with another set of questions about where the water came from and where it went Some scientists believe innumerable floods formed Snowy River, dropping a thin layer of calcite each time. Areas of Fort Stanton Cave are open to those who get permits from the BLM, but Snowy River—deep in the cave behind locked metal gates—is off—limits. It’s unlikely Snowy River ever will be open to anything but research because of the fragility of the tiny calcite crystals and microbes on the cave walls.
Which of the following statements is true about the Snowy River?
选项 A、It extends its passage beneath the hills of southeastern New Mexico.
B、Its attraction is a crust of tiny crystal.
C、It is a wonder underground, which looks like a white river four miles long.
D、Some well-known microbes are uncovered, which makes the River unique.
答案A
解析 下列关于雪河的说法中，哪一项正确?[A]雪河的通道位于新墨西哥州东南部连绵山脉的地下。[B]雪河吸引人的地方在于微小结晶体组成的硬壳。[C]雪河是一道地下奇观，看起来就像是一条绵延四英里的白色河流。[D]一些知名的微生物种类被发现，使得雪河变得非常独特。从文章第二段第三句中的which is at least four miles long可以看出，[C]是不符合文章内容的；[B]与文章第一段第五句不符；从第二段第四句的following thepassage…可知[A]是正确的；从第三段前两句可以看出[D]与原文内容相悖。故选[A]。
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