Skip to content
Prep
Freely
Home
TOEFL
IELTS
Guides
Log in
Sign up
P
Account
Profile
My progress
Settings
Log out
TOEFL
/
Listening practice
/ Section DPZ9
Listen to an Academic Talk
Listen to a talk in a physics class.
Listen
25. What is the talk mainly about?
A
Why the sound of a moving object seems to change
B
Why some musicians have a good ear for pitch
C
How ambulance sirens were invented
D
How weather radar was developed