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TOEFL
/
Listening practice
/ Section LFG4
Listen to an Academic Talk
Listen to part of a talk in a climate science class.
Listen
31. Why does the speaker mention the heavier form of oxygen?
A
To explain how temperature is recovered from the ice
B
To show why some layers melt and others do not
C
To describe how bubbles are sealed
D
To argue that the ocean has grown warmer