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 ______.

admin2009-02-15  68
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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