单选题
What does second paragraph mainly discuss?
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.
【正确答案】
A
【答案解析】
[分析] 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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