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Listening practice
/ Section JY9Q
Listen to an Academic Talk
Listen to part of a talk in a physics class.
Listen
28. Why are the headphones ineffective against a nearby conversation?
A
The microphone cannot detect sound from behind the listener.
B
Speech contains high frequencies that cannot be cancelled in time.
C
Voices are louder than an aircraft engine.
D
Conversations change direction too quickly to be tracked.