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Official 47 Lec 2
Question 4 of 6
What does the professor imply about theories that explain how albatross navigate?

A.

They are based on studies of seabirds in captivity

B.

They are based on observations of albatross in the wild

C.

They are guesses that are not based on any evidence about birds

D.

They have not been confirmed by studies of albatross themselves

正确答案:D

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