海洋生物学 TPO23-L3 Dolphin&’s Navigation

TPO23-L3

Dolphin’s Navigation

Listen to part of a lecture in a marine biology class.

 



  1. What is the lecture mainly about?
  • A. Parts of the dolphin’s anatomy that allow it to navigate.
  • B. Two different types of communication used by dolphins.
  • C. The way that dolphins store air while swimming underwater.
  • D. The meanings of different signals used by dolphins.

 

  1. Why does the professor discuss the speed at which sound travels?
  • A. To describe why sounds made under water can travel long distances.
  • B. To show why a person cannot hear a dolphin well when it is under water.
  • C. To compare the speed of two different sounds made by dolphins.
  • D. To explain how sound waves behave when crossing from one medium into another.

 

  1. What is the dolphin’s melon?
  • A. An oval-shaped bone that lets the dolphin hear sounds.
  • B. An organ made of fat tissue that helps a dolphin send sound waves.
  • C. An air-filled cavity that lets the dolphin breathe underwater.
  • D. An organ filled with water that helps the dolphin measure depth.

 

  1. What is the dolphin’s jaw able to do?
  • A. Send rapid clicking sounds into water.
  • B. Increase the speed of sounds.
  • C. Receive sound waves that have reflected off objects.
  • D. Force water through the nasal sacs and out the blowhole.

 

  1. How does the professor organize the information in the lecture?
  • A. By describing a phenomenon and the physical structures that make it possible.
  • B. By describing several of the dolphin’s senses and their relative usefulness.
  • C. By contrasting how the dolphin makes two different types of sounds.
  • D. By describing an old theory and then a new theory.

 

  1. Why does the professor say this: 🎧

 

  • A. To find out whether students are familiar with the lecture topic.
  • B. To mention a related topic that will not be discussed in detail.
  • C. To mention a common misconception about dolphin vocalizations.
  • D. To point out a primary function of dolphin blowholes.


答案:
C C AD D D B

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