The passage indicates that What kind of animal has a greater ability to regenerate a lost part?

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问题 The passage indicates that
What kind of animal has a greater ability to regenerate a lost part?

选项 A、Younger and more highly-developed ones.
B、Younger and less-developed ones.
C、Older and less-developed ones.
D、Older and more highly-developed ones.

答案B

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