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TOEFL
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Listening practice
/ Section 8CAK
Listen to an Academic Talk
Listen to part of a talk in a materials science class.
Listen
27. Why does the speaker mention a rug with a ripple in it?
A
To explain why metals are flexible when heated
B
To illustrate how a dislocation travels through a metal
C
To describe the arrangement of carbon atoms
D
To show how a metal returns to its original shape