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TOEFL
/
Listening practice
/ Section JY9Q
Listen to an Academic Talk
Listen to part of a talk in a physics class.
Listen
27. Why does the speaker say the operation must happen in under a millisecond?
A
To show why high frequencies are difficult to cancel
B
To argue that the electronics are more important than the speaker
C
To indicate how quickly the microphone must be replaced
D
To explain why the headphones need a battery