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The largest shark known to us, Megalodon, is extinct. Or is it? Carcharodon Megalodon, com

monly known as Megalodon, is believed to have lived between I 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 axe 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 the 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!

The following is commonly known EXCEPT ________.

A.Megalodon, the largest shark, is extinct

B.Megalodon is not extinct but just out of reach

C.Megalodon was 52 feet long and had a jaw 7 or more feet wide

D.Megalodnn lived between several million years ago

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更多“The largest shark known to us,…”相关的问题
第1题
There are about 350 species of sharks. The largest sharks are the whale shark and the bask
ing shark, which feed on plankton and small fish. The adult whale shark grows to about 13 meters long, while the basking shark extends a little over 8 meters.(46)On the other hand, there are a number of them which have attacked and killed swimmers. These sharks include the great hammerhead, blue, whitetip, and, of course, the great white shark.

(47)The great white grows to between 5 and 8 meters long and can weigh more than 1300 kilograms. It can swim through the eater at speeds reaching 32 kilometers per hour. However, one of the fastest swimmers in the shark family is the blue shark, which can swim at a speed of nearly 752 kilometers per hour.

(48)They can grow as long as 5 centimeters, and they are very sharp. Unlike humans, who have two sets of teeth in their life time, some sharks can have as many as 5 or 6 sets. It is rare for a shark to have fewer than 4 sets. It is rare for a shark to have fewer than 4 sets. As the shark's teeth are worn out, they fall out and are replaced by the next row.

(49)In a lifetime some sharks can grow and lose between 10,000 and 30,000 teeth.

Sea biologists have discovered that the shark has a remarkably large brain and a well-developed sensory system. The animal has an extraordinary sense of smell and excellent vision.

(50)Special sensory pits on the shark's nose and chin can detect weak electrical fields in the water that are produced by fish and other animals. Scientists have concluded that sharks associate food with electrical fields. Scientists also believe that sharks create their own electrical fields to aim them in knowing where to go in the sea.

A. Must of the species are not particularly cruel.

B. Sharks have lived on earth for more than 180 million years.

C. The great white is the largest and cruelest of all animals known to attack humans.

D. Some sharks can wear out a full set of teeth in less than 6 months.

E. One of the most unusual aspects of the shark is its teeth.

F. But sharks are also sensitive to electrical fields.

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第2题
A.A shark attacks a person for no reason.B.A shark attacks a person every time it sees

A.A shark attacks a person for no reason.

B.A shark attacks a person every time it sees one.

C.A shark attacks a person only if it is bothered.

D.A shark attacks a person only at night.

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第3题
A.All sharks have teeth.B.A shark can have six rows of teeth.C.A shark can have hundre

A.All sharks have teeth.

B.A shark can have six rows of teeth.

C.A shark can have hundreds of teeth.

D.All sharks have extremely sharp teeth.

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第4题
A.All sharks have teeth.B.A shark can have six rows of teeth.C.A shark can have hundred

A.All sharks have teeth.

B.A shark can have six rows of teeth.

C.A shark can have hundreds of teeth.

D.All sharks have extremely sharp teeth.

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第5题
A shark finds its prey by .

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第6题
It's a __(海豹)()

A.shark

B.seal

C.rab

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第7题
The scientists say one effect of shark fishing has been an estimated ______ decrease in so
me shark populations.

A.9%

B.19%

C.90%

D.99%

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第8题
Spark生态系统是什么()。

A.HiveQL

B.Shark

C.SparkR

D.DataFrame

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第9题
Why is the demand for shark fins rising in Asia?A.Because there are fewer sharks in Asia.B

Why is the demand for shark fins rising in Asia?

A.Because there are fewer sharks in Asia.

B.Because shark fins can be used for medical purposes and for food.

C.Because shark fins are poisonous.

D.Because shark fins are expensive.

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第10题
选出不同种类的一项()

A.igger

B.shark

C.olphin

D.parrot

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