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

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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