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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
30. According to the speaker, why are ice cores unusually trustworthy?
A
They contain trapped samples of the ancient atmosphere
B
They are found on every continent
C
They can be dated by counting layers alone
D
They are unaffected by the weight of ice above