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Listening practice
/ Section 4V75
Listen to an Academic Talk
Listen to part of a talk in a zoology class.
Listen
26. What does the speaker say about a bird's hollow bones?
A
They are always lighter than the equivalent mammal bones.
B
They are reinforced inside and the material is differently placed.
C
They are filled with air sacs connected to the lungs.
D
They are more likely to break than solid bones.