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TOEFL
/
Listening practice
/ Section W7R7
Listen to an Academic Talk
Listen to a talk in an environmental science class.
Listen
27. How do CFCs damage the ozone layer?
A
They make the atmosphere colder.
B
They block sunlight from reaching the ozone.
C
Sunlight breaks them apart, and they release chlorine.
D
They react with rain to form acid.