Home
Listening
Listen to an Announcement Test #215
Listen to an Announcement
1. What is the main subject of the professor's talk?
A) The decline of bird populations in cities
B) The genetic makeup of urban birds
C) An animal's adaptation to city noise
D) A comparison of different bird species
2. Why do city birds sing at a higher pitch?
A) To attract mates from farther away
B) Because their songs are easier to hear
C) It is a result of a genetic mutation
D) To imitate the sounds of the city
A fascinating recent study looked at how urban noise affects bird communication. Researchers found that certain species of birds living in noisy city environments sing at a higher pitch than their counterparts in quieter, rural areas. This change is not genetic; it's an adaptation. The higher-pitched songs are more easily heard over the low-frequency background noise of traffic and construction. This finding shows just how adaptable some wildlife can be to human-altered environments, adjusting their behavior to survive and communicate effectively.
Highlights
| ID: | #io7925617861 |
Tags
New TOEFL