Narrator: Listen to part of a lecture in a biology class. Professor: So, we've been discussing animal communication, and today I want to focus on a fascinating example: the honeybee's waggle dance. When a foraging bee returns to the hive after finding a good food source, it performs a series of movements on the vertical surface of the honeycomb. This dance encodes information about the direction and distance of the food. The direction is indicated by the angle of the dance relative to the sun's position, and the distance is indicated by the duration of the waggle phase. For instance, if the food is directly toward the sun, the bee dances straight up. If the food is at an angle to the sun, the dance is offset by that same angle. This discovery, made by Karl von Frisch, was revolutionary because it showed that bees have a symbolic language, not just simple signals. However, recent research has added nuance: the dance's accuracy can be affected by factors like wind speed and the bee's previous experience. So, while the waggle dance is a remarkable system, it's not always perfectly precise.
❓ Câu hỏi What does the professor mainly discuss in the lecture?
A. A. The limitations of Karl von Frisch's research methods
B. B. How honeybees communicate the location of food sources
C. C. The effects of wind on honeybee foraging behavior
D. D. The differences between bee communication and other animal communication
✅ Đáp án đúng
B. How honeybees communicate the location of food sources
TOEFL Listening Tips
Skim the questions first to predict the content
Watch for signal words in lectures and conversations (however, actually, in fact)
For main idea questions, focus on the beginning; for detail questions, focus on examples and data
For attitude questions, pay attention to the speaker's tone and word choice
Take notes on keywords; don't try to write down every word
