Which of the following questions does the passage answer? The author mentions "the green film of plant life that grows on stagn

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问题 Which of the following questions does the passage answer?
The author mentions "the green film of plant life that grows on stagnant pools" (lines 6-7) in order to explain ______.

选项 A、how the sun affects lichens
B、why plants depend on water
C、where fungi become algae
D、what algae arc

答案D

解析
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