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______.

admin2009-09-15  44
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...giving in return oxygen which the animal needs to breathe可知，植物为动物提供了生活必需的氧气。所以正确的答案为D。
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