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TOEFL
/
Listening practice
/ Section 7YSB
Listen to an Academic Talk
Listen to part of a talk in a demography class.
Listen
46. Why does the speaker say the momentum "works in reverse"?
A
To show that a low birth rate cannot be quickly undone
B
To argue that pyramids should be drawn upside down
C
To explain why birth rates eventually recover
D
To describe how migration alters the shape