听力音频：
L1
讲座
1. What is the lecture mainly about?
The advantages of traveling in groups to avoid predators
Various reasons why a predator might avoid certain prey
Why some animals are unable to perform thanatosis successfully
How playing dead helps some animals avoid being attacked
2. Why does the fire-bellied toad show its belly to predators?
To warn predators that the toad can bite
To make predators believe that the toad is poisonous
To remind predators that the toad tastes unpleasant
To indicate to predators that the toad smells bad
3. Why does the professor mention a study involving cats and quail?
To support a claim about predators’ hunting instincts
To show that thanatosis is not always successful
To emphasize the effectiveness of cats as predators
To explain why birds perform a different type of thanatosis than mammals
4. Why does the professor describe the exoskeleton of young fire ants?
To identify their primary means of self-defense against predators
To explain how they are able to run quickly away from dangerous situations
To show that they are particularly vulnerable to bites and stings
To explain why they are the first to be attacked by invading ants
5. According to the professor, how does performing thanatosis benefit a colony of fire ants under attack?
It helps the weaker colony members conserve energy.
It confuses the attacking group into thinking that the battle is finished.
It distracts the attackers from the ants that are fighting back.
It allows the more valuable colony members to survive.
6. Why does the professor say this:
To introduce a fact that she finds surprising
To correct a false conclusion that the student may have drawn
To provide an exception to a general rule about predators
To indicate that a certain defensive behavior is not always effective
