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TOEFL
/
Listening practice
/ Section TJD6
Listen to an Academic Talk
Listen to part of a talk in an astronomy class.
Listen
47. What can be inferred about a spectrum whose lines are unusually broad?
A
The source contains an unknown element.
B
The source is moving away from the observer.
C
The source is unusually dense.
D
The instrument has been poorly calibrated.