听力音频：
L2
讲座
1. What is the lecture mainly about?
Two species of butterflies that prey on other insects
The use of a defense mechanism in two species of butterflies
Why two species of butterflies have multiple predators
Why it is difficult for butterflies to defend themselves outdoors
2. What point does the professor make when she mentions birds and bats?
Some organisms have more predators than other organisms.
Some predators are less effective than others at catching prey.
Different predators use different senses when preying on organisms.
Different organisms hibernate in different surroundings.
3. According to the professor,why might a predator flee from a peacock butterfly that flicks its wings?（多选题）
The butterfly’s wings release a strong odor.
The butterfly’s wings produce a frightening sound.
The butterfly appears to move suddenly toward the predator.
The movement of the butterfly’s wings reveals a starting pattern.
4. Why does the professor mention bumblebees?
To explain why mice usually search for prey in attics
To explain that mice rely on sight to detect their prey
To give an example of an insect other than a butterfly that hibernates
To provide evidence that a certain sound is threatening to mice
5. The professor states that the tortoiseshells in the Stockholm study generally did not defend themselves by flicking their wings.What did she say is a possible reason?
The tortoiseshells were not able to replace behavior used outdoors with a new behavior when indoors.
The cold temperatures in the attic prevented the tortoiseshells from moving.
Tortoiseshells tend to rely on the distinctive patterns on their wings for protection. Tortoiseshells have not evolved the ability to produce a sound when they flick their wings.
6. What does the professor imply about the Stockholm study when she says this:
The study provides evidence that peacocks prey on other insects.
The study challenges previous beliefs about the peacocks’flicking behavior.
The study confirms that eye-spots account for the peacocks’successful defense indoors.
The study was flawed because the peacocks were not observed in their natural environment.
