2. 外语
  3. Life forms that cannot keep up with the newest species on the block will always risk extinction,____________(除非他们适应新的挑战).

Life forms that cannot keep up with the newest species on the block will always risk extinction,____________(除非他们适应新的挑战).

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问题 Life forms that cannot keep up with the newest species on the block will always risk extinction,____________(除非他们适应新的挑战).
选项
答案unless they adapt to the new challenge
解析
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大学英语四级

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