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17.听第9材料,回答第15-17题.
15.What are the speakers mainly talking about?
A.A sandstorm.B.Their daily life.C.The green shelter belt.
16.What does the woman think of the past spring?
A.It's clear.B.It's awful.C.It's pleasant.
17.How did the people solve the problem?
A.They planted trees and grass.B.They left their hometowns.
C.They put on more clothes.

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