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  3. It has been 50 years since the Trieste submersible made the only descent of humans into the deepest place in the ocean, the Mari

It has been 50 years since the Trieste submersible made the only descent of humans into the deepest place in the ocean, the Mari

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问题     It has been 50 years since the Trieste submersible made the only descent of humans into the deepest place in the ocean, the Mariana Trench. In the coming decades, we need to look again into the depths of our own piece of the solar system. We’ve explored only about 5 percent of the ocean. It’s maddening that we know so little about what the seafloor looked like at the site of the Deepwater Horizon spill before the oil began to leak. It’s only a mile underwater! For us to have better maps of the moon, Mars, and Jupiter than our own ocean floor is baffling.
    The natural world, especially the ocean, keeps us alive. More than half of all of the oxygen in our atmosphere is generated by organisms in the sea. We need to understand the systems that sustain us. Underwater monitoring and remote-operated vehicles such as the Nereus are improving, but those alone are not enough. The human brain and senses, the ability to wonder and to confront the unexpected—you can’t get that out of a machine.
    Japan, Russia, and France(but not the United States)have deep-diving submersibles that can carry humans down to 5,000 meters and beyond. There is currently no manned sub with the capacity to go to full ocean depth, 11,000 meters. The technology already exists; We could build a pair of three-person deep-diving subs for less than $ 50 million. James Cameron is well on the way to having a one-person sub for that depth.
    Therefore, we need to pull up our socks and realize that we still have a chance to prevent the loss of all sharks, coral reefs, and rain forests and to stabilize our atmosphere and the acidification of our oceans. Living in undersea laboratories nine times, I’ve had the opportunity to get to know individual fish and their quirky habits. I’ve met humpback whales, sea turtles, giant groupers, and an egg-bearing octopus I encountered in a one-person sub—creatures who had never seen a human before.
    Many animals are struggling through this time of perilous change. But we alone can understand what is happening and what to do about it. Seeing the sharp declines in parts of the ocean I have come to know and love reminds me that as we look into new ways to protect our planet from climate change, we need to look again at the natural machinery that already works, that developed over four and a half billion years, and do everything we can to restore its functions. It is the engine that will power us to the future.
The author’s experience in the sub mentioned in Paragraph 4 is to______.
选项 A、introduce some species people scarcely know
B、enrich our knowledge about the ocean
C、amuse us with more vivid details
D、exemplify the need for marine conservation
答案D
解析 篇章题。解答与篇章结构相关的题目，需具有全局观念，明确文章主旨和写作意图方可做出正确的判断。通读伞文，可以看出作者联系新近发生的事件和技术的新发展，指出海洋探索的重要性和人们对此的重视不足。在此语境中讲述自己经历，可见是为了给自己的观点增加论据。[D]指出讲述的目的是为了给海洋保护的必要性提供例证，显然是符合主旨和文体的，故[D]为答案。四个选项中最易排除[C]。根据前文的内容即可明确判断作者写作的目的不是取悦读者。文章并非一篇科普文章，也不是发表新近的研究发现，故[A]“介绍人们不了解的物种”和[B]“丰富我们的海洋知识”都是错误的。
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