Some birds like to sit on a sheep because . We learn from the text that corals depend on plants for .

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问题 Some birds like to sit on a sheep because ______.
We learn from the text that corals depend on plants for ______.

选项 A、comfort
B、light
C、food
D、oxygen

答案D

解析从文章第二段第四句In their skins there are tiny plants which act as "dustmen"，taking some of the waste products from the corals and giving in return oxygen which the animal needs to breathe．得知。

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Some birds like to sit on a sheep because ______. We learn from the text that corals depend on plants for ______.

公共英语二级笔试

公共英语（PETS）

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