Listening audioscript

THE STUDENTS DISCUSS TWO POSSIBLE SOLUTIONS TO THE WOMAN’S 
PROBLEM. DESCRIBE THE PROBLEM. THEN EXPLAIN WHICH OF THE 
TWO SOLUTIONS YOU PREFER AND EXPLAIN WHY. 

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LPREP IBT 3 E AudioScript 
71
Question 6, Page 219
[ mp3 097-098] 
Now listen to part of a lecture in a biology class.
(Professor)
Today, I’ll be talking about echolocation, and the way the scientists that 
proved it used several different methods to do so. 
 
Echolocation is a technique used by some animals, such as bats, 
toothed whales, and dolphins to determine what’s in their surroundings. 
The animals emit clicking sounds or calls and then listen for the echoes 
from nearby objects to be reflected back to them. This allows the animal 
to form a map of what’s around it. 
OK, so that bats could do this was postulated over 200 years ago, but 
there wasn’t definitive proof until the twentieth century. Two scientists, 
named Griffin and Galambos, used both an old method and technology 
that had been recently invented at the time to prove that bats use 
echolocation. The first thing that they did was something that had been 
done long before, but they made more careful measurements of the 
results. They covered some bats’ ears and observed how they flew. They 
confirmed that these bats were completely disoriented and crashed into 
objects much more often than bats who could hear. 
A second experiment involved a newly invented device that could detect 
very high-frequency sounds – much higher than humans can hear. They 
found that when the bats were flying, the device detected high-frequency 
sounds. It also measured the fact that the sounds were detected more 
often if the bat was approaching an object. Uh…that is, the bats made 
more calls as they got closer to an object they wanted to avoid. 
Finally, the two scientists used other new technology to measure how the 
cells in the inner ears of the bats respond to sounds, and they found that 
the bats’ cells responded to sounds much higher than a human can hear. 
So, really, the best way to prove something is to do so in multiple ways.