Passage 14 The largest shark known to us, Megalodon,is extinct. Or is it? Carcharodon Megalodon, commonly known as Megalodon, isbelieved to have lived between 1 million and 5 million years ago and thought tohave been 52 feet long. It is (or was) a shark that had a jaw 7 or more feetwide. Fairly recently, there has been some speculation about whether it isextinct or just out of reach. But few people believe that Megalodon has found ahome deep in the ocean. There are many known “Living Fossils”:Coelacanth, Sea Cucumbers, Sea Urchins, Lobsters, Sea Stars. The common oneslike 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 accessibleto us. What if they weren't accessible and yet still existed? We would labelthem extinct. The discovery of a live Coelacanth, a fish long believed extinct,challenged some scientists’ long-held beliefs on extinction. There have beenrecent discoveries of incredibly large squid, and deep-sea fish never beforeseen by scientists. In the 1960s the U.S. Navy set upunderwater microphones around the world to track Soviet submarines. Thenetwork, known as the Sound Surveillance System, still lies deep below theocean's surface in a layer of water known as the “deep sound channel”. Thetemperature and pressure of the channel allow sound waves to travelundisturbed. NOAA’s Acoustic Monitoring Project has been using the SoundSurveillance System to listen for changes in ocean structure like oceancurrents or volcanic activity. Most of the sounds recorded are common and of noconcern. One sound, identified in 1977 by U.S. Navy “spy” sensors, was odd. Itwas obviously a marine animal but the call was more powerful than any of thecalls 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 oneis sure. It was named “Bloop”. Could it be Megalodon? If Megalodon is stillalive down in the bottom of the ocean, we may some day soon discover it. Thenwhat? Deep sea diving will never be the same, that’s for sure! 61. The following is commonly known EXCEPT________. A. Megalodon, the largest shark, is extinct B. Megalodon is not extinct but just out ofreach C. Megalodon was 52 feet long and had a jaw7 or more feet wide D. Megalodon lived between several millionyears ago. 62. What makes scientists doubt about thebelief that Megalodon is extinct? A. The discovery of many “Living Fossils”. B. The discovery of the fossils oflobsters. C. The discovery of a live Coelacanth. D. The discovery of the fossils of seaurchins. 63. What was special in their recordedsounds? A. To listen for changes in oceanstructure. B. To listen for changes of ocean currentsor volcanic activity. C. To make sure whether there was a giantsquid deep in the ocean. D. To follow the track of the Sovietwarships under water. 64. What was special in their recordedsounds? A. A strange, powerful animal sound washeard. B. A big whale’s sound was heard. C. A sea monster’s sound was heard. D. A giant squid’s sound was heard. 65. What can be concluded from the passage? A. Scientists’ discoveries always changepeople’s belief. B. There are too many secrets to bediscovered. C. Megalodon may be still alive deep in theocean. D. “Deep sound channel” allows sound wavesto travel undisturbed.