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TOEFL
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Listening practice
/ Section RHZK
Listen to an Academic Talk
Listen to part of a talk in an environmental science class.
Listen
26. Why does the bottom layer lose its oxygen in summer?
A
Because the water is too cold to hold oxygen
B
Because wind drives oxygen out of the lake
C
Because plants at the bottom consume it during the day
D
Because it is separated from the surface and oxygen is used up by decay