The word "it" in line 3 refers to What does the author say in paragraph 1 regarding most species in Earth’s history

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问题  The word "it" in line 3 refers to
  What does the author say in paragraph 1 regarding most species in Earth’s history

选项 A、They have remained basically unchanged from their original forms.
B、They have been able to adapt to ecological changes.
C、They have caused rapid change in the environment.
D、They are no longer in existence.

答案D

解析
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