OG3 阅读 Q24

Choice B is the best answer. In (lines 6-11"wings ...fly"), the author provides evidence that Dial's central assumption in setting up his research is that the acquisition of flight in young birds is linked to the acquisition of flight in their ancestors. The author notes that Dial created a project to "come up with new data on the age-old ground-up-tree-down debate."
Choices A, C, and D do not provide the best evidence that Dial's central assumption in setting up his research is that the acquisition of flight in young birds is linked to the acquisition of flight in their ancestors. Choices A, C, and D are incorrect because they focus on Dial's experiment and his obser-vations on ground birds.