L2
讲座
1. What is the lecture mainly about?
Theories about how some spiders catch their prey
Reasons that researchers often misinterpret animal behavior
Possible explanations for a certain animal behavior
Ways in which spiders have adapted to specific environments
2. Why does the professor emphasize that the function of decorated spider webs is to trap prey?
To review a previous lesson on insects
To point out an apparent contradiction related to decorated webs
To remind students to observe spider webs carefully
To prevent a common misconception about the diet of spiders
3. What evidence does the professor provide to support the prey-attraction hypothesis?
（多选题）
Decorated webs attract the spiders’ main source of food
The decorations use colors that only bees can see
The decorations help hide spiders from the bees.
Spider webs with more decorations catch more bees.
4. Why does the professor mention a study comparing webs made by well-fed spiders with webs made by hungry spiders?
To illustrate a challenge to the hypothesis that spiders make web decorations to attract prey
To explain that spiders have to make more decorations in order to eat more
To support the hypothesis that spider webs in good locations do not need decorations
To demonstrate that spiders use too much energy when building decorations
5. According to the lecture,how do birds react to spider web decorations?
Birds tend to avoid webs with decorations.
Birds use the silk of the decorations to build nests.
Birds are attracted by the ultraviolet light in the decorations.
Birds often fly into decorated webs by mistake.
6. What is the professor’s opinion of the studies about the function of spider web decorations?
She believes that some of the studies were better designed than others.
She doubts that the studies contribute to the understanding of web-decorating behavior. She thinks researchers have overlooked a key explanation for decorations
She thinks the results varied because the studies used different species
