OG3 阅读 Q26

Choice C is the best answer. The author explains that Dial's "aha moment" came when he determined the Chukars used "their legs and wings coop-eratively" to scale the hay bales (lines 40-42"while...that"). Dial then created additional experiments to study how the birds dealt with gradually steeper inclines: "[he filmed] the birds as they raced up textured ramps tilted at increasing angles" (lines 46-48"series...began").
Choices A, B, and D are incorrect because Dial's "aha moment" was not fol-lowed by Dial teaching the birds to fly, studying videos to find out why the birds no longer hopped, or consulting with other researchers.