听力音频：
L1
讲座
1. What is the discussion mainly about?
How the escape behavior of lizards and mammals differs
Possible reasons for a type of behavior exhibited by lizards
How researchers disproved a theory about lizard behavior
Various means animals use to avoid predators
2. Why does the professor mention that lizards are capable of running quietly over
dry leaves?
To emphasize how impressed she is with lizards’ abilities
To point out that running noisily allows lizards to run faster
To show that the behavior of lizards changes when other lizards are around D. To
refute the idea that lizards run noisily because of the environment they live in
3. What can be inferred about white-tailed deer?
Their preferred strategy for avoiding predators is to remain still.
Some of their strategies for avoiding predators are similar to those used by lizards.
They are less likely than lizards to notice the approach of a predator.
They are more likely than lizards to send signals to a predator.
4. According to the signal hypothesis, what message does lizards’ behavior send to
predators?（多选题）
That the lizard is larger than it actually is
That the lizard is aware of the predator
That chasing the lizard would be useless
That the lizard has given a warning to other lizards
5. What did the researchers discover that supports the signal hypothesis?（多选题）
Lizards make noise even when the predator cannot see them.
Lizards that make noise tend to be strong runner
Lizards travel fastest when running by themselves.
Lizards do not make noise when a predator is nearby.
6. What does the student imply when she says this:
She realizes that her original idea was probably incorrect.
She understands that the new observations support her conclusion.
She realizes why the professor misunderstood her point.
She wants to explain why she disagrees with the researchers’ conclusion.
