雅思聽力|每天6分鐘聽力練習(xí)——Which are more dangerous sharks or humans

Sam
Hello. This is 6 Minute English from BBC Learning English. I’m Sam.

Rob
And I’m Rob. Now, on Friday the 29th of June 1975, movie posters appeared in cinemas all over the USA with the now notorious words: ‘You’ll never go in the water again’. So, do you know which movie was being promoted, Sam?

Sam
Yes, I think it was ‘Jaws’ - Steven Spielberg’s infamous horror movie which terrified a generation with its story of a man-eating great white shark with a taste for revenge and for human flesh.

Rob
'Jaws' multiplied people’s fascination with, and fear of, sharks.?

Sam
But sharks’ fearsome reputation is not based on facts: most attacks on humans are cases of mistaken identity, where the shark mistakes a swimmer for fish. In recent years the average annual number of worldwide deaths from shark bites was as low as four.

Rob
Today sharks should be the?apex predators?of the ocean - the top predator that hunts and eats other animals but has no natural predator of its own.

Sam
Instead, over 100 million sharks are caught and killed each year and, thanks to this overfishing, many shark species are now endangered. We’ll hear more soon, but first I have a question for you, Rob. approximately, how many different species of shark exist today? Is it:
a) 330?
b) 530???or
c) 730?

Rob
Well, I’ll take a guess at b) 530.

Sam
OK, I’ll reveal the correct answer later in the programme.

Rob
Now, as Sam mentioned, ‘Jaws’ made many people nervous about swimming in the sea, largely thanks to scenes in the movie showing the shark biting swimmers in a frenzy of teeth and blood.?

Sam
George Burgess has spent 40 years studying the cause of shark attacks in his job as director of the Florida Programme for Shark Research. According to him, the movie’s depiction of great whites is totally unrealistic, as he told BBC World Service programme, The Inquiry.

George Burgess
Will a single shark that’s involved in a bite on a human be more likely to bite another human in the future? In other words, is there something of the ‘Jaws’ image as we saw, unfortunately, in the movies of which you had a white shark that, apparently, had?a grudge?and would try to go after humans… well,?nothing could be further from the truth?than that.

Rob
In the movie, sharks are portrayed as vengeful creatures who recognise and try to kill individual people. The shark in Jaws had?a grudge?– a feeling of anger or hatred towards someone because of what they did in the past.

Sam
According to marine biologist, George Burgess, this is nothing like the real behaviour of sharks in the wild. He says?nothing could be further from the truth?– an expression used to emphasise that something is not true at all.

Rob?
The actual truth is that sharks have been perfectly designed by evolution for their ocean environment. In fact, they have hardly changed over the last 400 million years, making them even older than the dinosaurs.

Sam
Sharks’ characteristic design – their fin, teeth and skin – allows them to thrive in their natural environment. Listen to Oliver Crimmin, senior curator at London’s Natural History Museum, explaining more to BBC World Service programme, The Inquiry.

Oliver Crimmin
If we look at the really successful features of sharks you’ve got to consider this?cartilaginous?skeleton – that’s no bone in the skeleton. That?flexible?material that the skeleton is made of enables sharks to be very?agile, and it enables them to be athletic and it’s lightweight.

Rob
Sharks’ skeletons are made of?cartilage, not bone.?Cartilage?is a strong flexible tissue which connects joints in the bodies of living creatures.

Sam
Feel for the bony material in the fold of your ear – that’s cartilage.

Rob
Not having bones allows sharks to be both?flexible?- able to bend without breaking, and?agile?- able to move their body quickly and easily. Boneless, bendy, and built for speed, sharks really are the perfect evolutionary design.

Sam
Yet overfishing and the cruel practice of finning, cutting off shark fins to make exotic soups and returning the wounded creature to the sea to die, are threatening shark numbers.

Rob
Which is why it’s tragic that so many of their species are facing extinction. And speaking of shark species, what was the answer to your question, Sam?

Sam
In my quiz question, I asked how many species of shark there are in existence.?

Rob
Yeah, and I guessed it was around 530 different species.

Sam
Which was the correct answer, Rob! And the variety of shark species is incredible, from giants like the great white to the tiny dwarf lantern shark.

Rob
Ok, let’s recap the vocabulary from this programme all about sharks, the ocean’s?apex predator?– that’s the top predator that hunts other animals but has no predators of its own.

Sam
If you hold?a grudge, you have feelings of anger towards someone because of something they did in the past.

Rob
The phrase,?nothing could be further from the truth,?is used to?emphasise that something is totally false.

Sam
Cartilage?is the strong flexible tissue connecting bones or joints in the body.

Rob
Flexible?means able to bend without breaking.?

Sam
And finally, if you’re?agile,?you can move your body quickly and easily.

Rob
Once again, our six minutes are over.

Sam
Bye for now!

Rob
Goodbye!