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

第1题

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 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!

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．Megalodon lived between several million years ago

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第2题

A．All sharks have teeth to cut prey.B．It is sure that sharks like to attack humans.C．T

A．All sharks have teeth to cut prey.

B．It is sure that sharks like to attack humans.

C．The largest types of sharks are known to be aggressive.

D．Tiger shark is one of those that have the worst records.

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第3题

听力原文：Most people picture sharks as huge, powerful, frightening animals that eat meat,

听力原文： Most people picture sharks as huge, powerful, frightening animals that eat meat, ready at any moment to use their sharp teeth to attack careless swimmers without provocation. There are numerous wrong opinions, however, in this conception of sharks.

First of all, there are about 350 species of shark, and not all of them are large. They range in size from the dwarf shark, which can be only 6 inches long and can be held in the palm of the hand, to the whale shark, which can be more than 55 feet long.

A second wrong opinion concerns the number and typo of teeth, which can vary tremendously among different species of shark. A shark can have from one to seven sets of teeth at the same time, and some types of shark can have sever al hundred teeth in each jaw. It is true that the fierce and predatory species do possess extremely sharp and brutal teeth used to rip prey apart; many other types of shark, however, have teeth more adapted to grabbing and holding than to cut ting and slashing.

Finally, not all sharks are frightening animals ready to strike out at humans. In fact, only 12 of the 350 species of shark have been known to attack humans, and a shark needs to be provoked in order to attack. The types of shark that have the worst record with humans are the tiger shark, the bull shark and the great white shark. However, for most species of shark, even some of the largest types, there are no known instances of attacks on humans.

(30)

A．Categorizing the different kinds of sharks.

B．Warning humans of the dangers posed by sharks.

C．Describing the characteristics of shark teeth.

D．Clearing up some misconceptions about sharks.

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第4题

The largest religion in the US is ___.A.BuddhismB.ChristianityC.IslamD.Hinduism

The largest religion in the US is ___.

A.Buddhism

B.Christianity

C.Islam

D.Hinduism

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第5题

Section BDirections: In this section, you will hear 3 short passages. At the end of each p

Section B

Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.

听力原文： Most people picture sharks as huge, powerful, frightening predators, ready at any moments to use their sharp teeth to attack careless swimmers without provocation. But, people may have some wrong ideas on the conception of sharks.

First, there are 350 species of shark, and not all of them are large. They range in size from the dwarf shark, which can be only 6 inches long and can be held in the palm of the hand, to the whale shark, which can be more than 55 feet long.

Second, the different species of shark vary. tremendously in the number and type of teeth. A shark can have from one to seven sets of teeth at the same time, and some types of shark earl have several hundred teeth in each jaw. It is true that the fierce and predatory species do possess extremely sharp and brutal teeth used to rip their prey apart: many other types of shark, however, have teeth more adapted to grabbing and holding than to cutting and slashing.

Finally, not all sharks are predatory animals ready to strike out at humans. In fact, only 12 of the 350 species of shark have been known to attack humans, and a shark needs to be provoked in order to attack. The types of shark that have the worst record with humans are the tiger shark, the bull shark, and the great white shark. However, for most species of shark, even some of the largest types, there are no known instances of attacks on humans.

(27)

A．It tries to categorize the different kinds of sharks throughout the world.

B．It tries to warn humans of the dangers posed by sharks.

C．It tries to describe the characteristics of shark teeth.

D．It tries to clear up misconceptions about sharks.

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第6题

Section BDirections: In this section, you will hear 3 short passages. At the end of each p

Section B

Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.

听力原文： Most people picture sharks as huge, powerful, frightening predators, ready at any moments to use their sharp teeth to attack careless swimmers without provocation. But, people may have some wrong ideas on the conception of sharks.

First, there are 350 species of shark, and not all of them are large. They range in size from the dwarf shark, which can be only 6 inches long and can be held in the palm of the hand, to the whale shark, which can be more than 55 feet long.

Second, the different species of shark vary tremendously in the number and type of teeth. A shark can have from one to seven sets of teeth at the same time, and some types of shark can have several hundred teeth in each jaw. It is true that the fierce and predatory species do possess extremely sharp and brutal teeth used to rip their prey apart: many other types of shark, however, have teeth more adapted to grabbing and holding than to cutting and slashing.

Finally, not all sharks are predatory animals ready to strike out at humans. In fact, only 12 of the 350 species of shark have been known to attack humans, and a shark needs to be provoked in order to attack. The types of shark that have the worst record with humans are the tiger shark, the bull shark, and the great white shark. However, for most species of shark, even some of the largest types, there are no known instances of attacks on humans.

(27)

A．It tries to categorize the different kinds of sharks throughout the world.

B．It tries to warn humans of the dangers posed by sharks.

C．It tries to describe the characteristics of shark teeth.

D．It tries to clear up misconceptions about sharks.

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第7题

Section BDirections: In this section, you will hear 3 short passages. At the end of each p

Section B

Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.

听力原文： Most people picture sharks as huge, powerful, frightening predators, ready at any moments to use their sharp teeth to attack careless swimmers without provocation. But, people may have some wrong ideas on the conception of sharks.

First, there are 350 species of shark, and not all of them are large. They range in size from the dwarf shark, which can be only 6 inches long and can be held in the palm of the hand, to the whale shark, which can be more than 55 feet long.

Second, the different species of shark vary tremendously in the number and type of teeth. A shark can have from one to seven sets of teeth at the same time, and some types of shark earl have several hundred teeth in each jaw. It is true that the fierce and predatory species do possess extremely sharp and brutal teeth used to rip their prey apart: many other types of shark, however, have teeth more adapted to grabbing and holding than to cutting and slashing.

Finally, not all sharks are predatory animals ready to strike out at humans. In fact, only 12 of the 350 species of shark have been known to attack humans, and a shark needs to be provoked in order to attack. The types of shark that have the worst record with humans are the tiger shark, the bull shark, and the great white shark. However, for most species of shark, even some of the largest types, there are no known instances of attacks on humans.

(27)

A．It tries to categorize the different kinds of sharks throughout the world.

B．It tries to warn humans of the dangers posed by sharks.

C．It tries to describe the characteristics of shark teeth.

D．It tries to clear up misconceptions about sharks.

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第8题

听力原文：Most people picture sharks as huge, powerful, frightening predators, ready at any

听力原文： Most people picture sharks as huge, powerful, frightening predators, ready at any moment to use their sharp teeth to attack unwary swimmers for no reason. [29] This idea of sharks, however, contains many misconceptions.

First, there are about 350 species of shark, and not all of them are large.

A second misconception concerns the number and type of teeth, which can vary tremendously among the different species of shark. A shark can have from one to seven sets of teeth at the same time, and some types of sharks can have several hundred teeth in each jaw. It is true that the fierce and predatory species do possess extremely sharp and brutal teeth used to rip their prey apart. [30] Many other types of sharks, however, have teeth more adapted for grabbing and holding than for cutting and slashing.

Finally, not all sharks are predatory animals ready to strike at humans without warning. In fact, [31] only 12 of the 350 species of shark have been known to attack humans, and a shark needs to be provoked in order to attack. The types of shark that have the worst record with humans are the tiger shark, the bull shark, and the great white shark. However, for most species of shark, even some of the largest types, there are no known instances of attacks on humans.

(4)

A．To categorize the different kinds of sharks.

B．To warn humans of the dangers posed by sharks.

C．To describe the characteristics of shark teeth.

D．To clear up misconceptions about sharks.

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第9题

SharksSharks are amazing fish that have been around since long before the dinosaurs existe

Sharks

Sharks are amazing fish that have been around since long before the dinosaurs existed. They live in waters all over the world, in every ocean, and even in some rivers and lakes.

Sharks and Bony Fish

Unlike bony fish, sharks have no bones; their skeleton is made of cartilage(软骨), which is a tough, fibrous substance, not nearly as hard as bone. Cartilage, a strong fibrous(纤维的) substance, is softer than bone; our nose and ears are made of cartilage. Sharks also have no swim bladder (unlike bony fish).

Size

There are many different species of sharks that range in size from the size of a person's hand to bigger than a bus. The whale shark is the largest fish in the world; the basking shark is the second largest fish. Fully-grown sharks range in size from 7 inches long (the Spined Pygmy shark), up to 50 feet long. Most sharks are intermediate in size, and are about the same size as people, 5 - 7 feet long. Half of the shark species are under 39 inches long.

Variety of Sharks

There are about 368 different species of sharks, which are divided into 30 families. These different families of sharks are very different in the way of look, live, and eat. They have different shapes, sizes, colors, fins, teeth, habitat, diet, personality, methods of reproduction, and other attributes. Some types of shark are very rare and some are quite common. The spiny dogfish shark is the most common shark.

Body Shapes

Sharks have a variety of body shapes. Most sharks have streamlined (流线型的), Some sharks have an elongated body shape (e. g. cookiecutter sharks and wobbegongs). Sawsharks have elongated snouts, thresher sharks have a tremendously elongated upper tail fin which they use to stun prey, and hammerheads have extraordinarily wide heads. The goblin shark has a large, pointed protuberance (突出) on its head; its purpose is unknown.

Teeth

The teeth of sharks are also striking. Sharks may have up to 3,000 teeth at one time. Most sharks do not chew their food, but swallow it down whole or in large pieces. The teeth are arranged in rows; when one tooth is damaged or lost, it is replaced by another. Most sharks have about 5 rows of teeth at any time. The front set is the largest and does most of the work.

Diet

Sharks vary greatly in their diets, but they are all carnivores(食肉动物). Some eat fish, other sharks, and marine mammals; some eat shellfish from the ocean floor; and others eat tiny bits of plankton(浮游动物) and small animals from the water as they swim with open mouths. They eat huge amounts of these tiny animals and plants.

Sharks Attacks

When some sharks (like the Great White or the Gray Reef shark) turn aggressive prior to an attack, they arch their back and throw back their head. They also move their tail more acutely (probably in preparation for a chase).

Sharks do not normally attack people, and only about 25 species of sharks are known to attack people. Sharks attack fewer than 100 people each year. Many more people are killed by bees or lightning.

The sharks that are the most dangerous to people are the great white shark, the tiger shark, the bull shark, and the oceanic white tip shark. The bull shark is the most frequent attacker of people as it swims in very shallow waters where people swim and is a very plentiful shark. Some of the other sharks that are known to have attacked people include the gray shark, blue shark, hammerhead shark, mako shark, nurse shark, lemon shark, black tip reef shark, wobbegongs, sandtiger, spitting sharks, and the porbeagle. Some people believe that sharks mistake people (especially people swimming on surf boards) for seals and sea lions, some of their favorite foods.

Occasionally, a group of sharks will attack a food source (for example, a scho

A．The passage tells us the habitat and migration of sharks.

B．The passage tells us why sharks are dangerous to people.

C．The passage introduces the evolutional process of sharks.

D．The passage introduces the basic information about sharks.

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第10题

SharksSharks are amazing fish that have been around since long before the dinosaurs existe

Sharks

Sharks are amazing fish that have been around since long before the dinosaurs existed. They live in waters all over the world, in every ocean, and even in some rivers and lakes.

Sharks and bony fish

Unlike bony fish, sharks have no bones; their skeleton is made of cartilage (软骨), which is a tough, fibrous substance, not nearly as hard as bone. Cartilage, a strong fibrous (纤维的) substance, is softer than bone; our nose and ears are made of cartilage. Sharks also have no swim bladder (unlike bony fish).

Size

There are many different species of sharks that range in size from the size of a person's hand to bigger than a bus. The Whale shark is the largest fish in the world; the basking shark is the second largest fish. Fully-grown sharks range in size from 7 inches long (the Spined Pygmy shark), up to 50 feet long. Most sharks are intermediate in size, and are about the same size as people, 5-7 feet long. Half of the shark species are under 39 inches long.

Variety of sharks

There are about 368 different species of sharks, which are divided into 30 families. These different families of sharks are very different in the way look, live, and eat. They have different shapes, sizes, color, fins, teeth, habitat, diet, personality, method of reproduction, and other attributes. Some types of shark are very. rare and some are quite common. The spiny dogfish shark is the most common shark.

Body shapes

Sharks have a variety of body shapes. Most sharks have streamlined (流线型的), Some sharks have an elongated body shape (e. g., cookiecutter sharks and wobbegongs). Sawsharks have elongated snouts, thresher sharks have a tremendously elongated upper tail fin which they use to stun prey, and hammerheads have extraordinarily wide heads. The goblin shark has a large, pointed protuberance (突出) on its head; its purpose is unknown.

Teeth

The teeth of sharks are also striking. Sharks may have up to 3,000 teeth at one time. Most sharks do not chew their food, but swallow it down whole or in large pieces. The teeth are arranged in rows; when one tooth is damaged or lost, it is replaced by another. Most sharks have about 5 rows of teeth at any time. The front set is the largest and does most of the wok.

Diet

Sharks vary greatly in their diets, but they are all carnivores (食肉动物). Some eat fish, other sharks, and marine mammals; some eat shellfish from the ocean floor; and others eat tiny bits of plankton (浮游动物) and small animals from the water as they swim with open mouths. They eat huge amounts of these tiny animals and plants.

Sharks' attacks

When some sharks (like the Great White or the Gray Reef shark) turn aggressive prior to an attack, they arch their back and throw back their head. They also move their tail more acutely (probably in preparation for a chase).

Sharks do not normally attack people, and only about 25 species of sharks are known to attack people. Sharks attack fewer than 100 people each year. Many more people are killed by bees or lightning.

The sharks that are the most dangerous to people are the great white shark, the tiger shark, the bull shark, and the oceanic white tip shark. The bull shark is the most frequent attacker of people as it swims in very shallow waters where people swim and is a very plentiful shark. Some of the other sharks that are known to have attacked people include the gray shark, blue shark, hammerhead shark, mako shark, nurse shark, lemon shark, blacktip reef shark, wobbegongs, sandtiger, spitting sharks, and the porbeagle. Some people believe that sharks mistake people (especially people swimming on surf boards) for seals and sea lions, some of their favorite foods.

Occasionally, a group of sharks will attack a food source (for example, a school of fish) in a maniacal fashion. They will wildly attack the food and anything in th

A．The passage tells us the habitat and migration of sharks.

B．The passage tells us why sharks are dangerous to people.

C．The passage introduces the evolutional process of sharks.

D．The passage introduces the basic information about sharks.

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