2. 外语
  3. In what case do bettas assume various colors? How does the betta breathe air?

In what case do bettas assume various colors? How does the betta breathe air?

admin2009-04-23  46
问题 In what case do bettas assume various colors?
How does the betta breathe air?
选项
答案The betta has to rise to the surface for air.
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大学英语六级

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