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

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 reathe．得知。故本题答案为D。
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