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  3. The largest shark known to us, Megalodon, is extinct. Or is it? Carcharodon Megalodon, commonly known as Megalodon, is believed

The largest shark known to us, Megalodon, is extinct. Or is it? Carcharodon Megalodon, commonly known as Megalodon, is believed

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问题 The largest shark known to us, Megalodon, is extinct. Or is it? Carcharodon Megalodon, commonly known as Megalodon, is believed to have lived between 1 million and 5 million years ago and thought to have been 52 feet long. It is (or was) a shark that had a jaw 7 or more feet wide. Fairly recently, there has been some speculation about whether it is extinct or just out of reach. But few people believe that Megalodon has found a home deep in the ocean.
    There are many known "Living Fossils": Coelacanth, Sea Cucumbers, Sea Urchins, Lobsters, Sea Stars. The common ones like lobsters and sea urchins are not really looked on as anything amazing. They’ve been around for thousands of years or more, and are easily accessible to us. What if they weren’t accessible and yet still existed? We would label them extinct. The discovery of a live Coelacanth, a fish long believed extinct, challenged some scientists’ long-held beliefs on extinction. There have been recent discoveries of incredibly large squid, and deep-sea fish never before seen by scientists.
    In the 1960s the U.S. Navy set up underwater microphones around the world to track Soviet submarines. The network, known as the Sound Surveillance System, still lies deep below the ocean’s surface in a layer of water known as the "deep sound channel". The temperature and pressure of the channel allow sound waves to travel undisturbed. NOAA’s Acoustic Monitoring Project has been using the Sound Surveillance System to listen for changes in ocean structure like ocean currents or volcanic activity. Most of the sounds recorded are common and of no concern. One sound, identified in 1977 by U.S. Navy "spy" sensors, was odd. It was obviously a marine animal but the call was more powerful than any of the calls made by any other reported sea creature. It was too big for a whale. Could it be a deep-sea monster? One possibility was a giant squid, but no one is sure. It was named "Bloop". Could it be Megalodon? If Megalodon is still alive down in die bottom of the ocean, we may some day soon discover it. Then what? Deep sea diving will never be the same, that’s for sure!
What can be concluded from the passage?
选项 A、Scientists’ discoveries always change people’s belief.
B、There are too many secrets to be discovered.
C、Megalodon may be still alive deep in the ocean.
D、Deep sound channel? allows sound waves to travel undisturbed.
答案C
解析 推断题，A(科学家的发现总在改变人们的观念)，B(还有很多秘密未被发现)，这两项并不能从本文中推断出来，故排除；D(“深海声道”能传播声波并使其不受干扰)，由第三段第三句可知，是声道的温度和压力能传播声波并使其不受干扰，故排除D；本文开篇第二句Or is it?提出了对巨齿鲨灭绝一说的质疑，末段倒数第四句Could it be Megalodon? 暗示Bloop有可能是巨齿鲨发出的，所以C(巨齿鲨仍然生活在深海)正确
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