2. 外语
  3. Certain species disappeared or became extinct___________________(是由于产生了新物种形式，它们可以更好地适应当时不断变化的地球环境)

Certain species disappeared or became extinct___________________(是由于产生了新物种形式，它们可以更好地适应当时不断变化的地球环境)

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问题 Certain species disappeared or became extinct___________________(是由于产生了新物种形式，它们可以更好地适应当时不断变化的地球环境)
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答案Certain species disappeared or became extinct as new forms arose that were better adapted to the Earth’s changing environment．/．．．when new forms arose that were better adapted to the Earth’s changing environment．
解析 一些物种消失或灭绝，是由于产生了新的物种形式，它们可以更好地适应当时不断变化的地球环境。
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大学英语六级

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