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TOEFL
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Listening practice
/ Section 6KLG
Listen to an Academic Talk
Listen to part of a podcast about animals.
Listen
31. What did the study of ducks show?
A
Ducks at the ends of a row kept one eye open toward possible danger.
B
Ducks close both eyes when they feel safe.
C
Ducks in the middle of a row slept less.
D
Ducks sleep only in groups.