TOEFL Listening Page 356/357 Biology

TOEFL Listening

Track 46/47

Page 356/357

Multiple Choice

What is the lecture mainly about?

• how dolphins produce sounds they make

•  how dolphins teach their young to identify signature whistles

• the professor's experience with dolphins on a research boat

• various ways dolphins communicate with each other 

Multiple Choice

According to a theory the professor mentions, why do dolphins travel side by side?

•  to view each other's bubble streams

   

•  to hear each other's signature whistles

•  to avoid interfering with other dolphins sonar clicks

•  to keep mother's close to their young 

Multiple Choice

What does the professor imply about Bubble streams?

•  they help protect dolphins from predators

• their function is similar to that of signature whistles

•  they do not appear to serve a communicative function

   

•  dolphins use them to sense the movement of the water 

Multiple Choice

Why does the professor mention the time she spent on a boat doing research?

•  to encourage students to do fieldwork

   

•  to inform students about a paper she wrote

• to show how scientists collect data on marine life

•  to illustrate that dolphins are difficult to locate 

Listen to Track 47

Multiple Choice

What does this example illustrate?

•  the differences between land and marine mammals

   

•  the importance of burst pulses as aware dolphins communicate

   

• one reason dolphins travel in large groups

•  one way dolphins use signature whistles