Some birds like to sit on a sheep because ______. What does the second paragraph mainly discuss?

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问题 Some birds like to sit on a sheep because ______.
What does the second paragraph mainly discuss?

选项 A、Some animals and plants depend on each other for existence.
B、Some animals and plants develop their relationship easily.
C、Some plants depend on each other for food.
D、Some animals live better together.

答案A

解析 从文章最后两句In their skin...needs to breathe.If the plants are killed...the corals  will die.说明了动物和植物之间相互依存的关系。
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