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TOEFL
/
Listening practice
/ Section BXTH
Listen to an Academic Talk
Listen to part of a talk in an engineering class.
Listen
27. Why does the speaker point out that towers are squeezed and cables stretched?
A
To argue that concrete towers are stronger than steel ones
B
To show that each material is used where it performs best
C
To describe how the bridge behaves in high winds
D
To explain why bridges must be inspected regularly